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Mercury 2.5 (0A855097 THRU 0G710612) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 2.5. Scroll down for exploded parts diagrams (11), specifications, and maintenance reference.

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17-95372 18-95295 12-8035161 26-95348 25-16131 27-95220 Prop Shaft Seal Kit with Shear Pin for Mercury Mariner 2.5HP 3.3HP | JLM Marine
17-95372 18-95295 12-8035161 26-95348 25-16131 27-95220 Prop Shaft Seal Kit with Shear Pin for Mercury Mariner 2.5HP 3.3HP | JLM Marine
$20.50
$20.50
files/12_f0dab45b-421b-4acb-8162-3f3be09b8964.jpgDefault Title
$20.50
309-65021-2 47-95289-2 47-114812 Water Pump Impeller for Tohatsu Nissan Mercury Mariner 2.5A 3.5A 3.5B | JLM Marine
309-65021-2 47-95289-2 47-114812 Water Pump Impeller for Tohatsu Nissan Mercury Mariner 2.5A 3.5A 3.5B | JLM Marine
$15.99
$15.99
files/12_464a2c48-d6fc-406f-94cb-e43ed89bfa85.jpgDefault Title
$15.99

Mercury 2.5 (0A855097 THRU 0G710612) Parts & Diagrams

🔎 Mercury 2.5 Reference Library — Exploded parts diagrams (11 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 2.5 is a 4-Stroke, 1-Cylinder outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke, 1-Cylinder
Horsepower 2 HP
Displacement 85 cc
Bore x Stroke 55 mm x 36 mm
Spark Plug (Type & Gap) NGK BPR6HS-10
Engine Oil Capacity 0.3 L (10 fl oz)
Recommended Engine Oil SAE 10W-30 Mercury 4-Stroke Outboard Oil
Gear Case Oil Capacity 180 mL (6.0 fl oz)
Idle Speed (in gear) 1200 RPM
Full Throttle RPM Range 5000-6000
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 2.5:

  • 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 2.5.

▶ACCESSORIES (1 parts) ACCESSORIES
Ref OEM Part # Part Name
- 14171Q2 MOTOR LOCK
▶CARBURETOR (44 parts) CARBURETOR
Ref OEM Part # Part Name
- 27-898101928 GASKET SET, Powerhead
1 1300-8M0203718 CARBURETOR Comment: (2.5) SN# USA-0G574242/BEL-9973100 & Up
2 95252 WIRE, Throttle
3 10-95321 BOLT
4 95253 BRACKET
5 95254 CAP
6 24-95322 SPRING
7 95255 PLATE
8 53-95323 E RING
9 8151261 JET NEEDLE Comment: (3)
10 952573 VALVE, Throttle Comment: SN# USA-0G574242/BEL-9973100 & Up
11 815126A1 JET NEEDLE
12 27-95324 GASKET
13 95259 FLOAT
14 95260 FLOAT BOWL
15 17-95327 PIN, Hinge
16 952621 HINGE
17 80,8150291 MAIN JET Comment: SN# USA-0G574242/BEL-9973100 & Up
18 10-953251 SCREW
19 27-95326 GASKET
20 95263A1 HINGE
21 8M0171808 SEAT, Needle Valve
22 10-95328 SCREW
23 24-95329 SPRING
24 95266 LEVER, Shutter
25 10-95331 SCREW
26 95265 PLATE, Choke
27 13-400256 LOCKWASHER, (M6)
28 11-95330 NUT
29 54-95332 CLAMP
30 10-95333 SCREW
31 25-811601 O-RING
32 10-815071 SCREW
33 95268 LEVER, Throttle
34 10-815072 SCREW
35 13-95238 LOCKWASHER
36 27-95336 GASKET
37 952672 BRACKET
38 23-952867 COLLAR Comment: SN# USA-0G574242/BEL-9973100 & Up
39 95269 KNOB
40 10-95338 SCREW
41 8151321 COVER Comment: (FORCE GRAY)
42 8150732 COVER Comment: (MARINER GRAY) SN# USA-0G574242/BEL-9973100 & Up
43 10-95339 SCREW
▶CD IGNITION (20 parts) CD IGNITION
Ref OEM Part # Part Name
- 262-822899A1 FLYWHEEL MAGNETO ASSEMBLY
1 262-822899 FLYWHEEL
2 823030T1 COIL, Exciter
3 10-16059 SCREW
4 11-95233 NUT
5 10-823031 SCREW
6 13-823032 LOCKWASHER Comment: (USE WHERE APPLICABLE)
7 823033 COIL, Ignition
8 10-16705 BOLT
9 823034T CD UNIT
10 12-953921 WASHER, Stainless Steel
11 23-823035 SPACER Comment: (SEE NOTE 1)
12 10-16832 BOLT, (M6 x 16)
13 13-16818 LOCKWASHER Comment: (SEE NOTE 1)
14 12-809931044 WASHER Comment: (SEE NOTE 1)
15 33-19796 SPARK PLUG Comment: (NGK#BPR6HS-10)(W/RESISTANCE)
16 85-95282A1 CAP KIT
17 87-823037A04 SWITCH ASSEMBLY, Emergency Stop
18 823054 LANYARD
19 54-160601 CLAMP
▶COWL AND FUEL TANK (30 parts) COWL AND FUEL TANK
Ref OEM Part # Part Name
1 2189-815098A2 TOP COWL ASSEMBLY Comment: FORCE GRAY
2 2189-824926A3 BOTTOM COWL Comment: (FORCE GRAY) PORT
3 2189-824927A3 BOTTOM COWL Comment: (STBD.) (FORCE GRAY) STBD.
4 8M0114258 LATCH KIT
5 17-825829 RIVET
6 817015A1 LATCH KIT Comment: (SEE NOTE 1)
7 817015 LATCH Comment: (SEE NOTE 1)
8 10-16827 SCREW
9 8151041 COVER Comment: (FORCE GRAY)
10 815105 HINGE, Rear
11 10-95386 BOLT
12 95280 PLATE
13 11-95385 NUT
14 25-95387 GROMMET
15 1258-824963A03 TANK ASSEMBLY, Fuel
16 36-8M0060029 CAP
17 36-812952 CAP Comment: (REFER TO DRAWING #1)
18 27-8M0065762 GASKET
19 25-815109 SEAL
20 10-803858 SCREW
21 13-16818 LOCKWASHER
22 12-95392 WASHER
23 23-95390 SPACER
24 22-95393 VALVE
25 32-8M0057113 LINE, Fuel (250 mm)
26 54-95395 CLIP, Stainless Steel
27 91-95399 TOOL KIT
28 17-815111Q02 PIN, Brass
29 18-95295 COTTER PIN
30 37-855577A1 DECAL, EPA Label Information (INSIDE TOP COVER) Comment: (1998)
▶CYLINDER BLOCK, CRANKSHAFT AND PISTON (38 parts) CYLINDER BLOCK, CRANKSHAFT AND PISTON
Ref OEM Part # Part Name
- 27-898101928 GASKET SET, Powerhead
1 878-91512 CYLINDER BLOCK/CRANKCASE
2 17-95218 PIN, Dowel
3 10-898103167 BOLT
4 10-95298 BOLT
5 27-95299001 GASKET
6 979-815062T2 CYLINDER HEAD Comment: (3)
7 10-815063 SCREW
8 12-809931044 WASHER
9 22-8M0064617 CONNECTOR
10 32-8M0057112 HOSE, (150 mm)
11 54-95224 CLIP Comment: (USE WHERE APPLICABLE)
12 952251 HEAD
13 10-815065 SCREW
14 12-16826 WASHER, Stainless Steel
15 54-8M0130961 CLAMP
16 34-95226 REED VALVE
17 34-95304 STOP
18 10-16067 SCREW
19 53-952366 CLIP Comment: SN# USA-0G574241/BEL-9973099 & Below
20 28-95229 KEY
21 30-898101936 BEARING, Ball (UPPER)
22 95230 PLATE (UPPER)
23 26-95232 SEAL, Oil (UPPER)
24 11-95233 NUT Comment: (USE WHERE APPLICABLE)
25 30-95307 BEARING, Ball (LOWER)
26 95231 PLATE (LOWER)
27 26-95308 SEAL, Oil (LOWER)
28 31-95227 BEARING, Roller
29 779-9183 PISTON Comment: (.5MM O.S.)
30 39-95309 RING, Piston Comment: (.5MM O.S.)
31 898101917 PIN, Piston
32 463-879147T16 CRANKSHAFT ASSEMBLY Comment: SN# USA-0G574241/BEL-9973099 & Below
33 463-8130491 CRANKSHAFT Comment: SN# USA-0G574241/BEL-9973099 & Below
34 463-813268 CRANKSHAFT
35 629-813269 CONNECTING ROD
36 31-813270 BEARING
37 813271001 PIN, Crank
▶DRIVESHAFT HOUSING AND CLAMP BRACKETS (47 parts) DRIVESHAFT HOUSING AND CLAMP BRACKETS
Ref OEM Part # Part Name
1 1599-8251312 HOUSING, Driveshaft Comment: (FORCE GRAY)
2 10-16830 BOLT
3 13-400256 LOCKWASHER, (M6)
4 12-16826 WASHER, Stainless Steel
5 8150821 CARRYING HANDLE Comment: (FORCE GRAY)
6 10-8M0204707 SCREW, (M6 x 25)
7 11-400212 NUT, (M6) Stainless Steel
8 10-823042 BOLT
9 27-815076002 GASKET
10 823163A2 HANDLE ASSEMBLY, Steering Comment: (MARINER GRAY) DESIGN I
11 10-4000354 SCREW, (M8 x 30) Comment: DESIGN I
12 12-16192 WASHER Comment: DESIGN I
13 22-95364 DAMPER Comment: DESIGN I
14 823162A4 HANDLE ASSEMBLY, Steering Comment: (FORCE GRAY) DESIGN II
15 10-4000354 SCREW, (M8 x 30) Comment: DESIGN II
16 12-823047 WASHER Comment: DESIGN II
17 22-823045 DAMPER Comment: DESIGN II
18 23-823046 SPACER Comment: DESIGN II
19 823162A4 HANDLE ASSEMBLY, Steering Comment: (FORCE GRAY) DESIGN III
20 10-40011151 SCREW, (M8 x 35) Stainless Steel Comment: DESIGN III
21 22-95364 DAMPER Comment: DESIGN III
22 95274 GRIP
23 3406-8150864 CLAMP BRACKET Comment: (GRAY) SN# USA-0G574242/BEL-9973100 & Up
24 10-898101337 BOLT
25 12-95375 WASHER
26 11-95374 NUT, (M8)
27 95278 BRACKET Comment: (FORCE GRAY)
28 8M0055576 DISTANCE ROD
29 13-400256 LOCKWASHER, (M6)
30 11-400212 NUT, (M6) Stainless Steel
31 10-8150321 THUMB SCREW ASSEMBLY Comment: (FORCE GRAY)
32 12-95379 PAD
33 3407-815112A3 SWIVEL BRACKET Comment: (FORCE GRAY)
34 3407-8112053 SWIVEL BRACKET Comment: (FORCE GRAY)
35 10-16830 BOLT
36 23-95381 BUSHING
37 10-8150341 SCREW, Adjusting Comment: (FORCE GRAY)
38 24-953838 SPRING
39 952791 FRICTION PAD
40 11-400213 NUT, (M8) Stainless Steel (USE WHERE APPLICABLE)
41 12-16826 WASHER, Stainless Steel
42 17-16119 PIN, Dowel
43 815092 THRUST ROD
44 24-8150931 SPRING
45 8M0058619 STOPPER, Tilt
46 NLA No Longer Available, O-RING
47 815096 KNOB
▶GEAR HOUSING ASSEMBLY (34 parts) GEAR HOUSING ASSEMBLY
Ref OEM Part # Part Name
- 27-8M0082878 GASKET SET, Lower Unit
1 1668-825123A2 GEAR HOUSING ASSEMBLY Comment: (FORCE GRAY)
2 30-95342 BEARING, Ball Comment: (LOWER)
3 23-95343 SPACER
4 30-95344 BEARING, Ball Comment: (UPPER)
5 53-95345 RING, Snap
6 97-823913Q ANODE
7 10-16832 BOLT, (M6 x 16)
8 22-8M0229353 SCREW, Drain
9 27-95220 GASKET
10 30-95347 BEARING
11 30-95344 BEARING, Ball
12 26-95348 SEAL, Oil
13 46-8150783 PUMP, Water Comment: (FORCE GRAY)
14 25-95288 O-RING
15 47-952892 IMPELLER
16 8251151 COVER Comment: (FORCE GRAY)
17 10-16705 BOLT Comment: USE WITH WASHER
18 12-16826 WASHER, Stainless Steel
19 26-95350 SEAL, Oil
20 23-95361 BUSHING Comment: (LOWER)
21 44-95291A1 PROPELLER SHAFT Comment: (WITH BEVEL GEAR)
22 15-811647A1 SHIM
23 43-95293 GEAR, Pinion
24 53-815066 RING, Snap
25 28-95371 KEY
26 32-95359 TUBE ASSEMBLY, Water
27 25-953601 GROMMET Comment: (UPPER)
28 45-95290 DRIVESHAFT Comment: (UPPER)
29 45-95369 DRIVESHAFT Comment: (LOWER)
30 95277 PIPE
31 17-815111Q02 SHEAR PIN, Stainless Steel Comment: (ALUMINUM PROP)
32 48-815084A02 PROPELLER, Aluminum (3 x 7.4 x 7) Comment: (WITH RUBBER HUB)
33 18-95295 COTTER PIN
▶MISCELLANEOUS INFORMATION (1 parts) MISCELLANEOUS INFORMATION
Ref OEM Part # Part Name
0 90-10100980 OWNERS GUIDE
▶RECOIL AND IGNITION COMPONENTS(BREAKER POINT IGNITION) (33 parts) RECOIL AND IGNITION COMPONENTS(BREAKER POINT IGNITION)
Ref OEM Part # Part Name
1 95244 HOUSING, Starter Comment: (MARINER GRAY)
2 10-815068 BOLT
3 95251 PLUG
4 50-12066Q10 ROPE
5 95249 HANDLE, Starter
6 24-95284 SPRING
7 95245 SHEAVE, Starter
8 95246 RATCHET
9 24-95315 SPRING
10 95247 COVER
11 24-95316 SPRING
12 95248 FRICTION PLATE
13 12-95317 THRUST WASHER
14 53-95318 E RING
15 95250 PULLEY
16 10-16828 BOLT
17 13-16818 LOCKWASHER
18 262-811595 FLYWHEEL MAGNETO Comment: CASTING # FOT30071
19 262-811596 FLYWHEEL Comment: CASTING # FOT30071
20 811597 BASE Comment: CASTING # FOT30071
21 811599T COIL, Exciter Comment: CASTING # FOT30071
22 811598 CONDENSER Comment: CASTING # FOT30071
23 10-95311 SCREW Comment: CASTING # FOT30071
24 10-95313 SCREW Comment: CASTING # FOT30071
25 95237 BREAKER Comment: CASTING # FOT30071
26 10-95310 SCREW Comment: CASTING # FOT30071
27 10-16821 SCREW Comment: CASTING # FOT30071
28 95242T COIL, Ignition
29 10-95314 SCREW
30 13-16818 LOCKWASHER
31 33-19796 SPARK PLUG Comment: (NGK# BPR-6HS-10)
32 85-95282A1 CAP KIT
33 87-823037A04 SWITCH ASSEMBLY, Emergency Stop
▶RECOIL STARTER(CD IGNITION) (17 parts) RECOIL STARTER(CD IGNITION)
Ref OEM Part # Part Name
1 8M0109575 STARTER ASSEMBLY, Recoil
2 815067 HOUSING, Starter
3 24-95284 SPRING
4 95245 SHEAVE, Starter
5 95246 RATCHET
6 24-95315 SPRING
7 95247 COVER
8 24-95316 SPRING
9 95248 FRICTION PLATE
10 12-95317 THRUST WASHER
11 53-95318 E RING
12 50-12066Q10 ROPE
13 95249 HANDLE, Starter
14 823039 PULLEY
15 10-16828 BOLT
16 10-815068 BOLT
17 95251 PLUG
▶TOOLS, SPECIAL (1 parts) TOOLS, SPECIAL
Ref OEM Part # Part Name
- 91-37241 PULLER PLATE

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 2.5 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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