Mercury 20 JET (1B000001 & Up) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 20 JET. Scroll down for exploded parts diagrams (29), specifications, and maintenance reference.

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photo of jlm marine carburetor repair kit for mercury mercruiser 6-25 hp 1395-97611 with paper and rubber gaskets in black and dark gray shades, featuring various cutouts, hole patterns, a red circular gasket, a coiled spring, a brass jet, and a white plastic needle assembly
1395-97611 18-7212 1395-9761 Carburetor Rebuild Kit for Mercury Mariner 6HP 8HP 9.9HP 10HP 15HP 20HP 25HP | JLM Marine
$18.13
$59.00
$18.13
files/24CR461-1.jpgDefault Title
$18.13
JLM Marine water pump impeller kit for Mercury 2-str 15-25 hp 4-str 9.9-15 hp 99157t2, photo of brass hub impeller with six black rubber blades, silver metal mounting plate with holes, black gasket, stainless steel housing cup, O-rings, and washers
Water Pump Impeller Kit – Fits Mercury/Mariner 9.9-25 HP (Replaces 46-99157T2, 85098A2, 99157A2)
$57.50
$63.00
$57.50
files/Water_Pump_Impeller_Kit_for_Mercury_2_Str_15-25_HP_4_Str_99-15_HP_99157T2_-_JLM_MARINE-8288065.jpgDefault Title
$57.50
magnetic oil plug 8m0058389 jlm marine for mercury mariner outboard mercruiser sterndrive stainless steel with yellow gasket
22-8M0058389 Gearbox Drain & Fill Screw Kit for Mercury MerCruiser | JLM Marine
$18.39
$18.39
files/Lower_Unit_Magnetic_Oil_Plug_for_Mercury_Mariner_Outboard_and_MerCruiser_Sterndrive___8M0058389_-_JLM_MARINE-8287063.jpgDefault Title
$18.39
Outboard Thermostat – Fits Mercury Marine 6 - 15 HP Two - Stroke Outboards (Replaces 14586) - JLM Marine Boat Parts Limited
Outboard Thermostat – Fits Mercury Marine 6-15 HP Two-Stroke Outboards (Replaces 14586)
$28.00
$28.00
files/Outboard_Thermostat_for_Mercury_Marine_6-15_HP_Outboard_Motors__18-3549_-_JLM_MARINE-8286891.jpgDefault Title
$28.00
Water Pump Repair Kit – Fits Mercury/Mariner 9.9 - 15 HP 4 - Stroke Outboards (Replaces 99157T2) - JLM Marine Boat Parts Limited
Water Pump Repair Kit – Fits Mercury/Mariner 9.9-15 HP 4-Stroke Outboards (Replaces 99157T2)
$25.99
$25.99
files/Water_Pump_Impeller_Kit_for_Mercury_-_Force_-_Mariner_47-85089T7_-_JLM_MARINE-8290146.jpgDefault Title
$25.99
Gearcase Drain Plug – Fits Mercury/MerCruiser Marine Engines (Replaces 10 - 79953Q04, 79953Q04) - JLM Marine Boat Parts Limited
Gearcase Drain Plug – Fits Mercury/MerCruiser Marine Engines (Replaces 10-79953Q04, 79953Q04)
$15.50
$15.50
files/Lower_Unit_Non-Magnetic_Oil_Plug_for_Mercury_Mariner_Outboard_and_MerCruiser_Sterndrive_______79953Q04_-_JLM_MARINE-8287053.jpgDefault Title
$15.50
Water Pump Impeller – Fits Mercury/Mariner 15 - 50 HP (Replaces 47 - 8508910) - JLM Marine Boat Parts Limited
47-85089-3 Water Pump Impeller for Mercury Mariner Chrysler Force | JLM Marine
$10.50
$10.50
files/Water_Pump_Impeller_for_Mercury_15-50_HP_47-8508910_-_0755466_-_JLM_MARINE-8289726.jpgDefault Title
$10.50

Mercury 20 JET (1B000001 & Up) Parts & Diagrams

🔎 Mercury 20 JET Reference Library — Exploded parts diagrams (29 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 20 JET is a 4-Stroke, Inline 2-Cylinder, EFI outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke, Inline 2-Cylinder, EFI
Horsepower 20 HP
Displacement 333 cc
Bore x Stroke 61 mm x 57 mm
Spark Plug (Type & Gap) NGK DCPR6E
Engine Oil Capacity 1.1 L (1.1 quart)
Recommended Engine Oil SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity 237 mL (8 fl oz)
Idle Speed (in gear) 750 ± 50 RPM (in gear)
Full Throttle RPM Range 5400-6200
Fuel Unleaded Gasoline, 87 Octane min.

Always verify specifications against your owner's manual for your specific serial number range.

Common Issues & Recommended Parts

Below are common maintenance scenarios for the Mercury 20 JET:

  • Water Pump / Overheating: If the tell-tale stream is weak or absent, the water pump impeller likely needs replacement. Inspect annually or every 100 hours. → Recommended: Water Pump Impeller Kit
  • Engine Oil / Maintenance Light: 4-stroke engines require regular oil and filter changes. Use marine-grade oil rated for your engine. Change every 100 hours or annually. → Recommended: Oil Filter, Engine Oil
  • Fuel Injector Issues (EFI models): Rough idle or misfires may indicate clogged fuel injectors. Use fuel stabilizer and clean injectors periodically. → Recommended: Fuel Injector, Fuel Filter
  • Gear Case Oil Leak: Check lower unit seals if gear oil appears milky (water contamination). Replace seals and gaskets during lower unit service. → Recommended: Lower Unit Seal Kit, Drain Plug Gaskets
  • Anode Corrosion: Inspect sacrificial anodes regularly, especially in saltwater. Replace when 50% depleted to protect against galvanic corrosion. → Recommended: Zinc/Aluminum Anode Kit

Parts Diagrams & OEM Part Numbers

Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Mercury 20 JET.

▶Accessories (1 parts) Accessories
Ref OEM Part # Part Name
- 87-823609A7 CONVERSION KIT, Tiller Handle Start Switch
▶Bottom Cowl (33 parts) Bottom Cowl
Ref OEM Part # Part Name
1 2193-9682A8 BOTTOM COWL Comment: (Black)
2 25-17231 GROMMET, Shift Shaft
3 10-4000332 SCREW, (M6 x 35)
4 17223 COVER, Harness
5 11-401366 NUT, (M6) Stainless Steel
6 11-401366 NUT, (M6) Stainless Steel
7 25-17226 GROMMET, Wire Harness
8 87-826677A3 SWITCH ASSEMBLY, Stop
9 8M0032846 RETAINER, Brass
10 15920Q54 LANYARD ASSEMBLY
11 19-17230 PLUG Comment: (Remote Control)
12 10-878608 SCREW, (#10-16 x .500)
13 39519 CUP Comment: (Remote Control)
14 25-8243641 GROMMET, Side Cover Comment: (Remote Control)
15 11-401366 NUT, (M6) Stainless Steel Comment: (Remote Control)
16 11-401366 NUT, (M6) Stainless Steel Comment: (Remote Control)
17 8M0053899 SIDE COVER Comment: (Remote Control)
18 56-8M0206596 SCREW, (M6 x 20) Comment: (Remote Control)
19 10-8M0214928 SCREW, (M6 x 16) Comment: (Remote Control)
20 8M0054857 SIDE COVER Comment: (Manual)(Tiller Shift)
21 25-824362 GROMMET Comment: (Tiller Shift)
22 56-8M0206596 SCREW, (M6 x 20) Comment: (Tiller Shift)
23 11-401366 NUT, (M6) Stainless Steel Comment: (Tiller Shift)
24 8M0054857 SIDE COVER Comment: (Manual)(Side Shift)
25 25-824361 GROMMET Comment: (Side Shift)
26 56-8M0206596 SCREW, (M6 x 20) Comment: (Side Shift)
27 11-401366 NUT, (M6) Stainless Steel Comment: (Side Shift)
28 10-852530 SCREW, (.250-20 x 1.50)
29 17220 LEVER, Cowl Latch
30 23-812707 BUSHING
31 816202 HOOK, Latch
32 13-37642 WAVE WASHER
33 11-17224 NUT, Latch Retaining
▶Carburetor(20/25/Jet 20) (32 parts) Carburetor(20/25/Jet 20)
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 1390-817405T23 CARBURETOR, (WMC-87A) Comment: (25 Hp/Jet 20)
2 1395-96461 VALVE, Throttle Comment: (WMC-65)(WMC-87A)
3 1395-96951 SHAFT, Throttle
4 1395-804997 SCREW
5 1395-804996 SPRING
6 1395-803861 VALVE, Inlet Needle
7 1399-3796 JET, (.076) Comment: (WMC-65)(WMC-87A)
8 1395-9171 PLUG
9 1395-823648 COVER, Diaphragm
10 1395-9697 SCREW
11 15827A1 BODY
12 1395-9643 SCREW
13 1395-96371 COVER, Fuel Pump
14 1395-9762 PLUG
15 1395-97611 GASKET/DIAPHRAGM KIT
16 1395-8237072 REPAIR KIT
17 1395-9699 PLATE, Manual
18 1395-823433 CHOKE, Electric, Electric
19 1395-9696 SCREW
20 27-192061 GASKET, Carburetor
21 1395-9635 DIAPHRAGM/GASKET
22 1395-9633 GASKET
23 F10064 SHAFT
24 1395-824401 LEVER, Float
25 1395-9844A1 SERVICE KIT, Primer/Injector Comment: (See Illustrations for Contents)
26 1395-9164 BOWL, Fuel
27 1395-91691 FLOAT
28 27-44426 GASKET
29 1395-5902 SCREW, (#6-32 x .187)
30 10-40019111 SCREW, (M5 x 35)
31 11-400211 NUT, (M5) Stainless Steel
▶Carburetor(Seapro/Marathon 20/25) (32 parts) Carburetor(Seapro/Marathon 20/25)
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 1392-823907T13 CARBURETOR, (WMC-86)
2 815133 VALVE, Throttle (WMC-52A)(WMC-86)
3 1395-96951 SHAFT, Throttle
4 1395-804997 SCREW
5 1395-804996 SPRING
6 1395-803861 VALVE, Inlet Needle
7 1399-5317 JET, (.046) (WMC-52A)(WMC-86)
8 1395-9171 PLUG
9 1395-8113541 SHAFT, Choke
10 1395-811805 LEVER, Choke
11 15827A1 BODY
12 1395-9643 SCREW
13 1395-96371 COVER, Fuel Pump
14 1395-811806 VALVE, Choke
15 1395-97611 GASKET/DIAPHRAGM KIT
16 1395-8237072 REPAIR KIT
17 1395-9699 PLATE
18 1395-811360 SCREW, Bowl Drain
19 1395-9696 SCREW
20 27-192061 GASKET, Carburetor
21 1395-9635 DIAPHRAGM/GASKET
22 1395-9633 GASKET
23 F10064 SHAFT
24 1395-824401 LEVER, Float
25 27-44426 GASKET
26 1395-811353 BOWL, Fuel
27 1395-91691 FLOAT
28 1395-5902 SCREW, (#6-32 x .187)
29 817425 LINK, Choke
30 10-40019111 SCREW, (M5 x 35)
31 11-400211 NUT, (M5) Stainless Steel
▶Clamp Bracket Assembly (35 parts) Clamp Bracket Assembly
Ref OEM Part # Part Name
1 1497-8796A7 BRACKET ASSEMBLY, Transom Comment: (Storboard) (Black)
2 1497-8794A9 BRACKET ASSEMBLY, Transom Comment: (Port) (Black)
3 10-92767A3 THUMB SCREW ASSEMBLY, (16 mm)
4 NSS NOT SOLD SEPARATE, Rivet
5 NSS NOT SOLD SEPARATE, Handle
6 10-768042 SHOULDER SCREW, Hex
7 12-73719 WASHER
8 11-826709109 NUT, (.250-28) Stainless Steel
9 11-93164 NUT, (.875)
10 10-4000333 SCREW, (M6 x 40)
11 41042 HANDLE
12 23-818538 SPACER
13 12-71421 WASHER, Nylon
14 8M0035075 TILT TUBE
15 12-71421 WASHER, Nylon
16 37-8237011 DECAL, Co-Pilot
17 17-56373A2 PIN ASSEMBLY, Tilt
18 24-92995 SPRING
19 10-4000333 SCREW, (M6 x 40)
20 11-93164 NUT, (.875)
21 54-8M0085928 CLIP
22 10-814945 SCREW, (.312-18 x 3.500) Stainless Steel
23 12-67981 WASHER
24 11-815848 NUT, (.312)
25 11-826709109 NUT, (.250-28) Stainless Steel
26 10-41523 SCREW, (.250-28 x 1.00)
27 96965 LEVER, Starboard Side
28 11-826709109 NUT, (.250-28) Stainless Steel
29 24-44581 SPRING
30 10-41524 SCREW, (.250-28 x 1.75)
31 10-41524 SCREW, (.250-28 x 1.75)
32 13-31030 WAVE WASHER
33 11-826709109 NUT, (.250-28) Stainless Steel
34 90901 STRAP, Port Side
35 10-41523 SCREW, (.250-28 x 1.00)
▶Crankshaft, Pistons and Flywheel (34 parts) Crankshaft, Pistons and Flywheel
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 10-40001248 SCREW, (M12 x 25)
2 12-86496 WASHER
3 258-859232T13 FLYWHEEL Comment: (Commercial)
4 NSS NOT SOLD SEPARATE, Decal-Warning
5 NSS NOT SOLD SEPARATE, Decal-Warning
6 43-99301 RING GEAR Comment: (Electric)
7 10-88190313 SCREW, (M5 x 13) Comment: (Electric)
8 26-859741 SEAL, Oil
9 31-85114T BEARING, Roller - Upper
10 28-20094 KEY, Woodruff
11 464-8978T2 CRANKSHAFT ASSEMBLY
12 822445A1 WEAR SLEEVE
13 NSS NOT SOLD SEPARATE, O-Ring
14 26-85107 SEAL, Oil, Lower
15 31-85113T BEARING, Roller - Lower
16 630-8835A4 CONNECTING ROD ASSEMBLY
17 10-91012 SCREW, (.250-28 Special)
18 31-879877A1 BEARING ASSEMBLY, Roller
19 NSS NOT SOLD SEPARATE, Roller
20 29-98295 BEARING, Needle
21 12-8M0012294 BEARING
22 767-879878A6 PISTON ASSEMBLY Comment: (.030 Oversize)
23 40-828119 LOCK RING, Piston Pin
24 39-18652A2 RING SET, Piston Comment: (.030 Oversize)
25 NSS NOT SOLD SEPARATE, Piston Ring
26 86992A5 BEARING ASSEMBLY, Center Main
27 NSS NOT SOLD SEPARATE, Bearing
28 NSS NOT SOLD SEPARATE, Thrust Washer
29 NSS NOT SOLD SEPARATE, Thrust Washer
30 NSS NOT SOLD SEPARATE, Needle Roller
31 NSS NOT SOLD SEPARATE, Thrust Washer
32 NSS NOT SOLD SEPARATE, Needle Roller
33 NSS NOT SOLD SEPARATE, Thrust Washer
▶Cylinder Block and Covers (46 parts) Cylinder Block and Covers
Ref OEM Part # Part Name
- 27-41499A88 GASKET SET
1 872-9533T40 CYLINDER BLOCK
2 22-15133 FITTING (45 Degree)
3 17-85171 PIN, Dowel
4 10-40001209 SCREW, (M10 x 60)
5 16-429173 STUD
6 NSS NOT SOLD SEPARATE, Decal-Serialization
7 10-40019111 SCREW, (M5 x 35)
8 11-400211 NUT, (M5) Stainless Steel
9 27-414172 GASKET
10 14112T REED BLOCK
11 27-414181 GASKET
12 41420A3 PLATE ASSEMBLY, Carb Adaptor
13 21-889781 CHECK VALVE
14 10-40011108 SCREW, (M5 x 20) Stainless Steel
15 32-892024122 TUBING, (240.00 Inches Bulk) (Cut to 13.25 Inch Length)
16 25-822370 O-RING, (2.362 x .103)
17 14408 COVER
18 10-40011107 SCREW, (M5 x 16) Stainless Steel
19 54-8M0024808 J CLIP Comment: (Quanity of 2 on Remote Control)
20 10-40011107 SCREW, (M5 x 16) Stainless Steel
21 14406 COVER
22 25-86391 O-RING
23 27-863895 GASKET
24 1028-8282A1 COVER ASSEMBLY
25 NSS NOT SOLD SEPARATE, Cover
26 22-390721 PLUG, Pipe (.125-27) Brass Comment: (Electric RC)
27 10-4000331 SCREW, (M6 x 30)
28 22-94848 FITTING
29 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 8.00 Inch Length)
30 22-996642 FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
31 10-4000333 SCREW, (M6 x 40)
32 143171 COVER
33 27-14318005 GASKET
34 27-8M0204714 GASKET
35 14586 THERMOSTAT
36 25-822370 O-RING, (2.362 x .103)
37 144071 COVER Comment: SN# 0P042111 & Below
38 54-825404 STRAP
39 10-40011107 SCREW, (M5 x 16) Stainless Steel
40 27-892158 GASKET, Exhaust Manifold
41 92329F03 MANIFOLD, Exhaust
42 27-892157 GASKET, Exhaust Manifold Cover
43 923301 COVER
44 10-4000333 SCREW, (M6 x 40)
45 16-8M0034424 STUD, (M6 x 50) Comment: (Seapro/Marathon)
▶Driveshaft Housing Assembly (21 parts) Driveshaft Housing Assembly
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 158664 SEAL, Adaptor Plate
2 99702A7 ADAPTOR PLATE ASSEMBLY
3 27-41670006 GASKET, Adaptor Plate
4 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
5 41211 BRACKET
6 NSS NOT SOLD SEPARATE, Exhaust Tube
7 96248A1 HOUSING ASSEMBLY
8 23-889715 SPACER, Water Tube
9 26-25329 SEAL
10 10-40011107 SCREW, (M5 x 16) Stainless Steel
11 32-862921 TUBE, Water Comment: (Long Shaft)(Heavy Duty)
12 1588-9098T5 HOUSING ASSEMBLY, Driveshaft Comment: (Black-Long Shaft)
13 27-433374 GASKET, Drive Shaft Housing
14 27-14621 GASKET
15 14534 COVER
16 10-14742 SCREW, (.250-20 x 1.25)
17 10-1993870 SCREW, (M8 x 70)
18 12-4002317 WASHER
19 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
20 17258T TRIM COVER Comment: (Black)
▶Electric Start Components (31 parts) Electric Start Components
Ref OEM Part # Part Name
1 853358T1 RECTIFIER
2 10-883075 SCREW, (#10-16 x 1.25)
3 84-11149A54 HARNESS ASSEMBLY, Adaptor
4 89-8M0185147 SOLENOID ASSEMBLY, Starter
5 23-8M0214955 BUSHING
6 25-818967 GROMMET
7 84-88809A5 WIRE ASSEMBLY
8 10-40011129 SCREW, (M6 x 25) Stainless Steel
9 8-32,11-26419 NUT, Brass
10 11-64015 NUT, (.250-20)
11 85-97861 INSULATOR
12 11-64015 NUT, (.250-20)
13 92753 RETAINER
14 84-92436A9 HARNESS ASSEMBLY, Engine Wiring
15 88-8M0207796 FUSE, 20 Ampere
16 50-8M0033984 STARTER MOTOR ASSEMBLY
17 10-96566 THRU BOLT
18 96564T END CAP, With Brushes
19 96565 ARMATURE
20 96563T END CAP
21 96562 DRIVE
22 96561 DRIVE KIT
23 10-421251 SCREW, (M8 x 55)
24 824918 CLIP Comment: (Local Electric)
25 87-823609A6 SWITCH ASSEMBLY, Start/Stop Comment: (Local Electric)
26 889734 HOUSING, Switch Comment: (Local Electric)
27 84-88439A28 CABLE ASSEMBLY, Battery - Black
28 84-88439A27 CABLE ASSEMBLY, Red - Battery
29 17461T11 MODULE KIT, Tachometer Adaptor
30 13541 PLUG, Male
31 54-816311T TIE STRAP, (8.00 Inches)
▶Fuel System Components(Commercial Engines) (25 parts) Fuel System Components(Commercial Engines)
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 35-889527A07 FILTER ASSEMBLY, Fuel Comment: SN# 1B153167 & Below
2 858731 BALL, Fuel Filter
3 35-87946K04 FILTER KIT, Fuel Comment: (Mercury Brand)
4 25-897536 SEAL
5 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 7.50 Inch Length)
6 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 5.50 Inch Length)
7 54-816311T TIE STRAP, (8.00 Inches)
8 25-18202 GROMMET
9 22-15781A9 CONNECTOR KIT, Fuel
10 10-8M0204707 SCREW, (M6 x 25)
11 53-11278 CLIP, Retaining
12 817426 INSERT, Choke Bezel
13 172291 BEZEL, Choke
14 817424 KNOB, Choke
15 817425 LINK, Choke
16 174421 COVER, Carburetor
17 19-47579 PLUG
18 10-40011110 SCREW, (M5 x 30) Stainless Steel
19 41750T INSERT
20 10-40011107 SCREW, (M5 x 16) Stainless Steel
21 8243701 STOP, Throttle
22 11-400213 NUT, (M8) Stainless Steel
23 1390-817405T20 CARBURETOR, (WMC-54A) Comment: (25 Hp)
24 27-192061 GASKET, Carburetor
▶Fuel System Components(USA-1B153167/BEL-0P365661 and Below) (29 parts) Fuel System Components(USA-1B153167/BEL-0P365661 and Below)
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 35-889527A07 FILTER ASSEMBLY, Fuel Comment: SN# 0P365661 & Below
2 858731 BALL, Fuel Filter
3 35-87946K04 FILTER KIT, Fuel Comment: (Mercury Brand)
4 25-897536 SEAL
5 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 7.50 Inch Length)
6 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 5.50 Inch Length)
7 54-816311T TIE STRAP, (8.00 Inches)
8 127332 WIRE, Fast Idle
9 24-11277 SPRING, Tension
10 128053 LEVER, Fast Idle
11 12803 BRACKET, Primer
12 174421 COVER, Carburetor
13 19-47579 PLUG
14 10-40011110 SCREW, (M5 x 30) Stainless Steel
15 10-79965 SCREW, (#8-32 x .500) Stainless Steel
16 10-12110 SCREW, (#6-32 x .750)
17 11-821979 NUT
18 112731 LEVER, Primer
19 11280 CAM BLOCK
20 53-11278 CLIP, Retaining
21 172291 BEZEL, Choke
22 128022 PRIMER KNOB
23 1390-817405T23 CARBURETOR, (WMC-65) Comment: (25 Hp/Jet 20)
24 11-400213 NUT, (M8) Stainless Steel
25 27-192061 GASKET, Carburetor
26 22-15781A9 CONNECTOR KIT, Fuel
27 10-8M0204707 SCREW, (M6 x 25)
28 25-18202 GROMMET
▶Fuel System Components(USA-1B153168/BEL-0P365662 and up) (29 parts) Fuel System Components(USA-1B153168/BEL-0P365662 and up)
Ref OEM Part # Part Name
- 804946T02 POWERHEAD ASSEMBLY
1 35-889527A07 FILTER KIT Comment: SN# 1B153168 & Up
2 858731 BALL, Fuel Filter
3 35-896375Q01 FILTER KIT Comment: (Quicksilver Brand)
4 25-98277001 SEAL
5 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 6.00 Inch Length)
6 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 5.50 Inch Length)
7 54-816311T TIE STRAP, (8.00 Inches)
8 127332 WIRE, Fast Idle
9 24-11277 SPRING, Tension
10 128053 LEVER, Fast Idle
11 12803 BRACKET, Primer
12 174421 COVER, Carburetor
13 19-47579 PLUG
14 10-40011110 SCREW, (M5 x 30) Stainless Steel
15 10-79965 SCREW, (#8-32 x .500) Stainless Steel
16 10-12110 SCREW, (#6-32 x .750)
17 11-821979 NUT
18 112731 LEVER, Primer
19 11280 CAM BLOCK
20 53-11278 CLIP, Retaining
21 172291 BEZEL, Choke
22 128022 PRIMER KNOB
23 1390-817405T23 CARBURETOR, (WMC-87A) Comment: (25 Hp/Jet 20)
24 11-400213 NUT, (M8) Stainless Steel
25 27-192061 GASKET, Carburetor
26 22-15781A9 CONNECTOR KIT, Fuel
27 10-8M0204707 SCREW, (M6 x 25)
28 25-18202 GROMMET
▶Gasket Set Components, Engine Overhaul (1 parts) Gasket Set Components, Engine Overhaul
Ref OEM Part # Part Name
- 85977002 SEAL, Rubber, Reed Block (Rubber) Comment: (Not Used in This Application)
▶Gear Housing(Driveshaft)(2.25:1 Gear Ratio) (44 parts) Gear Housing(Driveshaft)(2.25:1 Gear Ratio)
Ref OEM Part # Part Name
- 46-99157T2 PUMP KIT, Water
1 1600-8M0083538 GEAR HOUSING ASSEMBLY, Basic-Black (Black)
2 41121 SLEEVE
3 26-99325 SEAL
4 31-41326 BEARING, Roller
5 17-8M0084726 PIN, Dowel (.187 x .530)
6 10-79953Q04 SCREW KIT, (.375-16 x .250) Drain
7 12-191833 SEAL
8 35-41133 SCREEN, Water Inlet Port
9 10-40031112 SCREW, (M5 x 40)
10 22-8M0058389 PLUG KIT, Drain (Magnetic) Comment: (Magnetic)
11 12-191833 WASHER
12 35-41134 SCREEN
13 11-401365 NUT, (M5) Stainless Steel
14 31-98294A1 BEARING ASSEMBLY, Roller
15 NSS NOT SOLD SEPARATE, Cup
16 10-49908 SCREW, (.250-28 x .750)
17 43-98302 GEAR, Pinion (12 Teeth)
18 27-993261 GASKET
19 85083 FACE PLATE
20 12-866451 WASHER
21 28-8M0214993 KEY
22 47-8M0204712 IMPELLER
23 12-866451 WASHER
24 25-69202 O-RING
25 46-99157A02 PUMP ASSEMBLY, Water
26 NSS NOT SOLD SEPARATE, Insert
27 26-85090001 SEAL
28 25-86203 O-RING, Rubber
29 10-8248324 SCREW, (M6 x 16)
30 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
31 862933 SHIFT SHAFT Comment: (Long Shaft)
32 45-99198 DRIVESHAFT Comment: (Long Shaft)
33 85552001 BOOT
34 93878 RETAINER
35 25-35276 O-RING, (.734 x .139) Comment: (.734 x .139)
36 25-85594 O-RING, (.239 x .174) Comment: (.239 x .174)
37 12-85091 WASHER
38 24-93007 SPRING
39 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
40 17-85593 PIN, (.078 x .437)
41 85562A2 SHIFT CAM
42 17-85096 PIN, Drive
43 23-29804T SLEEVE
▶Gear Housing, Propeller Shaft - 2.25:1 Gear Ratio (28 parts) Gear Housing, Propeller Shaft - 2.25:1 Gear Ratio
Ref OEM Part # Part Name
- 26-85090A2 SEAL KIT
1 1600-8M0083538 GEAR HOUSING ASSEMBLY, Basic-Black (Black) Comment: (3.30 Inch/130 mm Torpedo Diameter)
43 97-98432Q6 TRIM TAB
44 10-4000354 SCREW, (M8 x 30)
45 12-8M0042642 WASHER, (.323 x .563 x .063) Stainless Steel
46 12-43328 WASHER
47 10-87810178 SCREW, (M10 x 35)
48 31-8M0103470 BEARING ASSEMBLY, Roller
49 NSS NOT SOLD SEPARATE, Cup
50 43-44213T1 GEAR, Forward (27 Teeth)
51 23-85557 BUSHING
52 85094 FOLLOWER, Cam
53 24-38114 SPRING
54 52-41040T1 CLUTCH
55 17-8M0020999 PIN
56 24-88680 SPRING
57 44-8166231 PROPELLER SHAFT
58 43-99542T GEAR, Reverse (27 Teeth)
59 99906T1 CARRIER ASSEMBLY, Bearing
60 31-21739 BEARING, Roller
61 26-41132 SEAL, Oil, Inner
62 26-41131 SEAL, Oil, Outer
63 25-85549 O-RING
64 87293 PLATE
65 10-90883 SCREW, (M5 x 16)
66 858498 THRUST HUB ASSEMBLY
67 48-19638A40 PROPELLER Comment: (Sea Pro/Marathon 20/25)
68 11-4011912 PROP NUT Comment: (Sea Pro/Marathon 20/25)
▶Ignition/Electrical Components (25 parts) Ignition/Electrical Components
Ref OEM Part # Part Name
NS 13540 CAP, Female
1 997621 COVER, Ignition Coil
2 10-1994155 SCREW, (M5 x 55)
3 855721T8 STATOR ASSEMBLY
4 10-4013910 SCREW, (M5 x 10)
5 54-856999 STRAP
6 10-62568 SCREW, (#10-16 x .375)
7 8M0084613 C WASHER
8 855713A3 SWITCHBOX ASSEMBLY Comment: (Commercial/Jet 20)
9 10-40019111 SCREW, (M5 x 35)
10 10-878608 SCREW, (#10-16 x .500)
11 98450A10 TRIGGER ASSEMBLY
12 86704T11 STATOR AUXILIARY
13 10-4013930 SCREW, (M5 x 30)
14 54-816311T TIE STRAP, (8.00 Inches)
15 33-938 SPARK PLUG Comment: (NGK #BPZ8H-N-10) (CAN/BELG.)
16 84-813715A2 CABLE SET, High Tension (5 and 8.25 Inch)
17 NSS NOT SOLD SEPARATE, Hi-Tension Cable
18 85-63709A1 BOOT/TERMINAL KIT
19 54-816311T TIE STRAP, (8.00 Inches)
20 339-832757A4 COIL KIT
21 10-32,11-45076 NUT, Brass
22 84-88807A10 CABLE ASSEMBLY, Black
23 54-24836 CLIP
24 10-48408 SCREW, (#10-16 x .500)
▶Jet Linkage (14 parts) Jet Linkage
Ref OEM Part # Part Name
1 11-87599 NUT
2 10,13-26996 LOCKWASHER, Stainless Steel
3 8239521 SHIFT HANDLE
4 828251 ROD END
5 24-828252 SPRING
6 12-846673 WASHER, (.265 x .500 x .060) Stainless Steel
7 18-56206 COTTER PIN
8 11-29598 NUT, (.250-28) Stainless Steel
9 828253 LEVER, Shift
10 10-828254 SCREW, (#10-32 x .750)
11 10-828255 SCREW, (#10-32 x 2.50)
12 828256 SHIFT ROD
13 828257 ROD END
14 828258 TILT LATCH ROD
▶Jet Pump Assembly (27 parts) Jet Pump Assembly
Ref OEM Part # Part Name
- 856143A4 JET PUMP ASSEMBLY
1 801411251 HOUSING, Pump
2 32-827490 HOSE, Lube
3 878376 SHIFT LINKAGE KIT
4 878381 CAM
5 878378 GATE, Reverse - With Bumper
6 47-855708T25 IMPELLER Comment: (Stainless Steel)
7 80141225 HOUSING, Intake
8 827188T LINER
9 45-8M0084536 DRIVESHAFT
10 12-879652 THRUST WASHER
11 30-879653 BEARING, Ball
12 23-827189 SLEEVE
13 11-827190 NUT
14 801430 ADAPTOR
15 801431 BASE, Pump
16 10-846500 SCREW, (#10-32 x 1.00) Stainless Steel
17 10-19925125 SCREW, (.375-16 x 1.25)
18 12-34931 WASHER, (.406 x .734 x .063) Stainless Steel
19 10-19924200 SCREW, (.312-18 x 2.00)
20 12-8M0207778 WASHER
21 10-801432 SCREW, (M10 x 35)
22 28-801405625 KEY, Impeller
23 15-801404625 SHIM, Impeller
24 14-801403625 TAB WASHER
25 10-90192 SCREW, (.250-20 x .750) Stainless Steel
26 10-F2211 SCREW, (#10-24 x .625) Stainless Steel
▶Jet Water Pump Components (12 parts) Jet Water Pump Components
Ref OEM Part # Part Name
- 46-99157T2 PUMP KIT, Water
1 85083 FACE PLATE
2 12-866451 WASHER
3 28-8M0214993 KEY
4 47-8M0204712 IMPELLER
5 12-866451 WASHER
6 25-69202 O-RING
7 46-99157A02 PUMP ASSEMBLY, Water
8 NSS NOT SOLD SEPARATE, Insert
9 26-85090001 SEAL
10 25-86203 O-RING, Rubber
11 10-8248324 SCREW, (M6 x 16)
▶Lube Chart (1 parts) Lube Chart
Ref OEM Part # Part Name
- NOPART NO PARTS LIST
▶Service/Support Material (1 parts) Service/Support Material
Ref OEM Part # Part Name
- 37-804663A07 DECAL, EPA Label Information (2007 and up)
▶Starter Assembly(Manual) (33 parts) Starter Assembly(Manual)
Ref OEM Part # Part Name
- 90906A23 STARTER ASSEMBLY, Recoil
1 86689A5 HOUSING ASSEMBLY, Starter
2 10-826253 SCREW, (.250-20 x .625)
3 53-818853 RING, Retaining
4 833161T FELT PAD
5 24-86857T01 SPRING
6 50-825269T01 SHEAVE, Starter
7 24-86851T02 SPRING
8 868501 CAM
9 53-86849T01 RING, Retaining
10 86853T01 CAM
11 24-868523 SPRING
12 50-12066Q10 ROPE
13 85174A1 HANDLE ASSEMBLY
14 NSS NOT SOLD SEPARATE, Retainer
15 44180 BUSHING, Rope
16 426264 SUPPORT
17 10-40019111 SCREW, (M5 x 35)
18 23-309772 SPACER
19 856154T01 SUPPORT
20 11-401385 NUT, (M5) Stainless Steel
21 93876T02 LEVER, Lower
22 17-38489 PIN, Roll
23 24-823778 SPRING, Upper Lock Lever
24 858925 LEVER, Lock, Upper
25 8M0183792 BUSHING
26 10-1993735 SCREW, (M6 x 35) Comment: (Non-Seapro/Marathon)
27 37-8272822 DECAL, Warning, High Voltage
28 NSS NOT SOLD SEPARATE, Decal-Servicing Referrral
29 37-881865 DECAL, Caution-Start in Gear Comment: (Start In Gear) (Remote Control)
30 NSS NOT SOLD SEPARATE, Decal-Emergency Start Procedure
31 12-69056 WASHER, (.255 x .620 x .030) Stainless Steel Comment: (Commercial Engines)
32 11-401386 NUT, (M6) Stainless Steel Comment: (Commercial Engines)
▶Swivel Bracket Assembly (53 parts) Swivel Bracket Assembly
Ref OEM Part # Part Name
- 27-41499A88 GASKET SET
1 165541 ROD, Reverse Hook
2 11-8M0204726 NUT, (.375-24) Stainless Steel Comment: (Tiller Handle)
3 821959 HANDLE Comment: (Tiller Handle)
4 12-29330 WASHER Comment: (Tiller Handle)
5 821957 BRAKE PLATE Comment: (Tiller Handle)
6 8165621 DISC Comment: (Tiller Handle)
7 822238A9 SWIVEL HEAD Comment: (Black)
8 821958A1 PLATE KIT Comment: (Tiller Handle)
9 10-40011126 SCREW, (M6 x 13) Stainless Steel Comment: (Tiller Handle)
10 8165621 DISC Comment: (Tiller Handle)
11 821961 ROD Comment: (Tiller Handle)
12 3415-822237A3 SWIVEL BRACKET Comment: (Black)
13 22-8M0169589 FITTING, Grease
14 22-8M0169589 FITTING, Grease
15 22-8M0169589 FITTING, Grease
16 23-85154A1 BUSHING KIT
17 25-86993 O-RING
18 NSS NOT SOLD SEPARATE, Bushing
19 NSS NOT SOLD SEPARATE, Bushing
20 NSS NOT SOLD SEPARATE, Washer
21 98830A3 HOOK ASSEMBLY, Reverse Lock
22 24-879894 SPRING Comment: (All other Models)
23 24-96018 SPRING
24 53-13194 RING, Retaining Comment: (Tiller Handle)
25 17-13195 PIN
26 12756 BRACKET Comment: (Tiller Handle)
27 24-12754 SPRING Comment: (Tiller Handle)
28 12758 LEVER Comment: (Tiller Handle)
29 53-13194 RING, Retaining Comment: (Tiller Handle)
30 17232A1 COVER Comment: (Tiller Handle)
31 10-19943100 SCREW, (M8 x 100)
32 10-1994360 SCREW, (M8 x 60)
33 12-36001 WASHER
34 11-400213 NUT, (M8) Stainless Steel
35 85123001 BUMPER, Front
36 85122001 MOUNT, Lower
37 10-125161 SCREW, (M8 x 133)
38 14894 MOUNT
39 12-85172 WASHER, Upper Mount Screw
40 12-43430 WASHER
41 11-400213 NUT, (M8) Stainless Steel
42 10-849838 SCREW, (.375-24 x 1.250) Comment: (Remote Control)
43 41323A03 ATTACHING KIT, Steering Link Comment: (Remote Control)
44 12-37828 WASHER, (.390 x .625 x .062) Stainless Steel Comment: (Remote Control)
45 11-8M0204726 NUT, (.375-24) Stainless Steel Comment: (Remote Control)
46 96186A2 BRACKET ASSEMBLY Comment: (Remote Control)
47 10-1993325 SCREW, (M10 x 25) Comment: (Remote Control)
48 13-400248 LOCKWASHER, (M10) Comment: (Remote Control)
49 NSS NOT SOLD SEPARATE, Decal-Serial Overlaminate
50 11-8M0204726 NUT, (.375-24) Stainless Steel Comment: (Remote Control)
51 12-37828 WASHER, (.390 x .625 x .062) Stainless Steel
52 96201 STRAP, Key (Included with Ride Guide Bracket) Comment: (Remote Control)
▶Throttle and Shift Linkage(Remote Control) (39 parts) Throttle and Shift Linkage(Remote Control)
Ref OEM Part # Part Name
1 10-8M0204707 SCREW, (M6 x 25)
2 12-65567 WASHER, (.265 x .750 x .048) Stainless Steel
3 13-99611 WAVE WASHER
4 23-823806 BUSHING
5 8319781 CAM, Throttle
6 24-42164 SPRING
7 888191 SPARK ARM
8 8327471 TIMING LINK
9 42161 LINK INTERLOCK
10 8236103 LEVER, Interlock Control
11 10-8M0204707 SCREW, (M6 x 25)
12 12-69056 WASHER, (.255 x .620 x .030) Stainless Steel
13 23-823806 BUSHING
14 823862 LEVER, Backplate
15 8238632 LEVER, Horizontal Shift Shaft, Port
16 8236011 SHIFT SHAFT, Horizontal
17 24-826077 SPRING, Detent
18 824994 SPRING, Plate
19 10-40011107 SCREW, (M5 x 16) Stainless Steel
20 881228A1 SHIFT ROD ASSEMBLY
21 817428 SOCKET
22 10-32,11-45076 NUT, Brass
23 881227A3 LINK ASSEMBLY, Throttle
24 817428 SOCKET
25 10-32,11-45076 NUT, Brass
26 23-825319 NYLINER
27 8251681 LEVER, Shift
28 822459 RETAINER
29 11-825677 PUSH NUT
30 12-35280 WASHER, (.255 x .620 x .030) Stainless Steel
31 11-401386 NUT, (M6)
32 23-825319 NYLINER
33 825169 LEVER, Throttle
34 822459 RETAINER
35 11-825677 PUSH NUT
36 12-35280 WASHER, (.255 x .620 x .030) Stainless Steel
37 11-401386 NUT, (M6) Stainless Steel
38 8251701 BRACKET, Mounting
39 10-4006731 SCREW, (M6 x 16)
▶Throttle and Shift Linkage(Side Shift) (24 parts) Throttle and Shift Linkage(Side Shift)
Ref OEM Part # Part Name
1 42161 LINK INTERLOCK
2 8236103 LEVER, Interlock Control
3 10-8M0204707 SCREW, (M6 x 25)
4 12-69056 WASHER, (.255 x .620 x .030) Stainless Steel
5 23-823806 BUSHING
6 823862 LEVER, Backplate
7 24-826077 SPRING, Detent
8 824994 SPRING, Plate
9 10-40011107 SCREW, (M5 x 16) Stainless Steel
10 8238632 LEVER, Horizontal Shift Shaft, Port
11 8236011 SHIFT SHAFT, Horizontal
12 8239521 SHIFT HANDLE
13 10-40019108 SCREW, (M5 x 20)
14 12-4002314 WASHER
15 8237582 BRACKET, Cable Anchor
16 12-65567 WASHER, (.265 x .750 x .048) Stainless Steel
17 13-99611 WAVE WASHER
18 8319781 CAM, Throttle
19 24-42164 SPRING
20 888191 SPARK ARM
21 8327471 TIMING LINK
22 10-8M0204707 SCREW, (M6 x 25)
23 23-823806 BUSHING
24 10-4006731 SCREW, (M6 x 16)
▶Throttle and Shift Linkage(Tiller Handle Shift) (39 parts) Throttle and Shift Linkage(Tiller Handle Shift)
Ref OEM Part # Part Name
1 87-813960A4 SWITCH ASSEMBLY Comment: (Local Electric)
2 10-88075020 SCREW, (M3 x 20) Comment: (Local Electric)
3 824923 PLATE Comment: (Local Electric)
4 54-12627 STRAP Comment: (Local Electric)
5 10-40011107 SCREW, (M5 x 16) Stainless Steel Comment: (Local Electric)
6 42161 LINK INTERLOCK
7 8236103 LEVER, Interlock Control
8 10-8M0204707 SCREW, (M6 x 25)
9 12-69056 WASHER, (.255 x .620 x .030) Stainless Steel
10 23-823806 BUSHING
11 823862 LEVER, Backplate
12 8238632 LEVER, Horizontal Shift Shaft, Port
13 8236011 SHIFT SHAFT, Horizontal
14 881228A2 SHIFT LINK ASSEMBLY
15 817428 SOCKET
16 10-32,11-45076 NUT, Brass
17 881227A1 LINK ASSEMBLY, Throttle
18 817428 SOCKET
19 10-32,11-45076 NUT, Brass
20 10-8M0204707 SCREW, (M6 x 25)
21 12-65567 WASHER, (.265 x .750 x .048) Stainless Steel
22 13-99611 WAVE WASHER
23 23-823806 BUSHING
24 8319781 CAM, Throttle
25 24-42164 SPRING
26 888191 SPARK ARM
27 8327471 TIMING LINK
28 8238083 SECONDARY GEAR
29 8238092 PRIMARY GEAR
30 23-823806 BUSHING
31 30-93008 BALL
32 24-8M0215005 SPRING
33 56-8M0206596 SCREW, (M6 x 20)
34 12-69056 WASHER, (.255 x .620 x .030) Stainless Steel
35 10-4000331 SCREW, (M6 x 30)
36 12-69056 WASHER, (.255 x .620 x .030) Stainless Steel
37 23-823807 BUSHING
38 8238102 CONTROL PLATFORM
39 10-4006731 SCREW, (M6 x 16)
▶Tiller Handle Assembly (30 parts) Tiller Handle Assembly
Ref OEM Part # Part Name
- 821468T2 TILLER HANDLE Comment: (Black) (Side Shift)
1 822148A2 COVER KIT Comment: (Side Shift)
2 822150 PULLEY
3 NSS NOT SOLD SEPARATE, Case
4 10-878608 SCREW, (#10-16 x .500)
5 432426 CABLE, Throttle Comment: (Side Shift)
6 432426 CABLE, Throttle Comment: (Side Shift)
7 85-960099 SLEEVE, (12.00 Inches)
8 821468A66 ARM ASSEMBLY, Steering Handle Comment: (Black)
9 10-4010516 SCREW, (M5 x 16) Stainless Steel
10 10-40011107 SCREW, (M5 x 16) Stainless Steel
11 821972T KNOB, Throttle
12 24-96203 SPRING
13 892995 LOCK, Throttle
14 10-8M0204707 SCREW, (M6 x 25)
15 821463T01 TILLER TUBE
16 37-8242004 DECAL Comment: (Side Shift)
17 821465 HANDLE, Throttle Comment: (Side Shift)
18 8M0221732 GRIP
19 87-823609A18 SWITCH ASSEMBLY, Start/Stop Comment: (Black)
20 822441 RETAINER
21 8221471 PLATE
22 23-823939 BUSHING
23 10-4000384 SCREW, (M10 x 80)
24 822841F1 BRACKET Comment: (Black)
25 23-823939 BUSHING
26 12-822145 WASHER
27 13-826792 WAVE WASHER
28 12-822145 WASHER
29 12-822146 WASHER
▶Tools, Special (1 parts) Tools, Special
Ref OEM Part # Part Name
- 91-30500 GREASE GUN
▶Top Cowl (15 parts) Top Cowl
Ref OEM Part # Part Name
1 2190-9163T21 TOP COWL ASSEMBLY Comment: (Silver)
2 44311F5 SHIELD, Rear Comment: (Silver)
3 10-400018 SCREW, (M5 x 12)
4 12-73288 WASHER, (.220 x .500 x .030) Stainless Steel
5 17221 LATCH, Cowl
6 10-400033 SCREW, (M5 x 12)
7 17773A2 SEAL, Cowl
8 815625A02 SOUND BLANKET KIT, (Pre-Applied Pressure Sensitive Adhesive)
9 NSS NOT SOLD SEPARATE, Sound Blanket
10 NSS NOT SOLD SEPARATE, Sound Blanket
11 10-400033 SCREW, (M5 x 12)
12 812413A1 BRACKET ASSEMBLY, Roller
13 18517 SHIM, Cowl Latch
14 37-804663A07 DECAL, EPA Label Information (2007 and up)
15 37-111851 SHIFT DECAL Comment: (Jet)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 20 JET running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

  1. Replace water pump impeller and inspect wear plate
  2. Change engine oil and oil filter (check drain plug washer)
  3. Replace spark plugs and check ignition timing
  4. Drain and refill lower unit gear oil; inspect for water contamination
  5. Inspect fuel lines, primer bulb, and fuel filter for deterioration
  6. Check and replace sacrificial anodes (zinc or aluminum)
  7. Inspect propeller for damage; check shaft seal and cotter pin
  8. Check valve clearance (refer to service manual for specifications)
  9. Lubricate all grease points (steering, tilt tube, shift linkage)
  10. Inspect control cables and throttle/shift linkage for smooth operation
  • Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
  • Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.

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