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Yamaha 2021 HELM-MASTE Outboard Motor Parts Diagram & Catalog

by JLM Marine 15 May 2025 0 Comments
Yamaha 2021 HELM-MASTE Outboard Motor Parts Diagram & Catalog

2ND HELM HARNESS

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Below is the parts list for Yamaha 2021 HELM-MASTE 2ND HELM HARNESS:

Yamaha 2021 HELM-MASTE 2ND HELM HARNESS Diagram
Position No. Part Name OEM Number
1 2ND ST HARNESS (P) 6X9-8258A-00-00
1 2ND ST HARNESS (P) 6X9-8258A-20-00
1 2ND ST HARNESS (P) 6X9-8258A-10-00
2 END OF LINE RESISTOR 6Y8-85371-01-00
3 2ND ST HARNESS (S) 6X9-8258A-50-00
3 2ND ST HARNESS (S) 6X9-8258A-30-00
3 2ND ST HARNESS (S) 6X9-8258A-40-00
4 2ND ST HARNESS (C) 6X9-8258A-70-00
4 2ND ST HARNESS (C) 6X9-8258A-80-00
4 2ND ST HARNESS (C) 6X9-8258A-60-00

BATTERY MANAGEMENT SYSTEM

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Below is the parts list for Yamaha 2021 HELM-MASTE BATTERY MANAGEMENT SYSTEM:

Yamaha 2021 HELM-MASTE BATTERY MANAGEMENT SYSTEM Diagram
Position No. Part Name OEM Number
1 BMS HARNESS 2 6X9-82716-10-00
2 SWITCHING UNIT ASSY 6X9-83396-00-00
3 BATTERY SWITCH PANEL 6X9-82570-A0-00
4 PANEL, SWITCH 6X9-82571-20-00
5 SEAL ASSY 6X9-22480-20-00
6 CAP 1 (12P) 6X9-82582-00-00
7 CAP 1 (6P) 6X9-82582-10-00
8 CAP 1 (6P) 6X9-82582-20-00
9 CAP 1 (9P) 6X9-82582-30-00
10 CAP 1 (8P) 6X9-82582-40-00
11 CAP 1 (8P) 6X9-82582-50-00
12 CAP 1 (3P) 6X9-82582-60-00
13 CAP 1 (2P) 6X9-82582-70-00
14 CAP 1 (6P) 6X9-82582-80-00

CL5 DISPLAY

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Below is the parts list for Yamaha 2021 HELM-MASTE CL5 DISPLAY:

Yamaha 2021 HELM-MASTE CL5 DISPLAY Diagram
Position No. Part Name OEM Number
1 CL5 DISPLAY 6YM-83710-12-00
2 SEAL ASSY 6YM-22480-00-00
3 CAP 1 6YM-83956-00-00
4 CAP 2 6YD-83957-00-00
5 RIM 6YM-83512-00-00
6 COVER, METER 6YM-87278-00-00
7 CONVERSION HARNESS 6YM-83553-00-00
8 WIRE, LEAD 6YD-8356N-00-00

CONVERSION HARNESS

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Below is the parts list for Yamaha 2021 HELM-MASTE CONVERSION HARNESS:

Yamaha 2021 HELM-MASTE CONVERSION HARNESS Diagram
Position No. Part Name OEM Number
1 CONVERSION HARNESS 6X9-83553-60-00
2 CONVERSION HARNESS 6X9-83553-20-00
3 CONVERSION HARNESS 6X9-83553-30-00
4 CONVERSION HARNESS 6X9-83553-40-00
5 CONVERSION HARNESS 6X9-83553-50-00

DEC 1 SINGLE

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Below is the parts list for Yamaha 2021 HELM-MASTE DEC 1 SINGLE:

Yamaha 2021 HELM-MASTE DEC 1 SINGLE Diagram
Position No. Part Name OEM Number
1 REMOTE CONTROL BOX ASSY 2 6X9-48A01-01-00
2 GRIP, LEVER SINGL 6X9-4822A-00-00
3 SCREW 1 6X9-48127-00-00
4 WASHER, INTERNAL TOOTH 92990-05300-00
5 COVER ASSY 6X9-48400-00-00
6 TUNING FORK MARK 6X9-42697-00-00
7 COVER, SINGLE 6X9-4811C-00-00
8 PLUG 6X9-48167-00-00
9 GROMMET 6X9-48176-00-00
10 SCREW, TAPPING 97780-50145-00
10 SCREW, PAN HEAD 98580-05060-00
11 WASHER 704-48287-00-00
12 NUT 95380-05600-00

DEC 2 MULTIPLE

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Below is the parts list for Yamaha 2021 HELM-MASTE DEC 2 MULTIPLE:

Yamaha 2021 HELM-MASTE DEC 2 MULTIPLE Diagram
Position No. Part Name OEM Number
1 REMOTE CONTROL BOX ASSY 3 6X9-48A02-01-00
2 GRIP, LEVER MULTI 6X9-4822B-00-00
3 SCREW 1 6X9-48127-00-00
4 WASHER, INTERNAL TOOTH 92990-05300-00
5 GRIP, CONTROL LEVER 6X9-48222-00-00
6 COVER ASSY 6X9-48400-00-00
7 TUNING FORK MARK 6X9-42697-00-00
8 COVER 6X9-48119-00-00
9 PLUG 6X9-48167-00-00
10 PLUG 2 6X9-48168-00-00
11 GROMMET 6X9-48176-00-00
12 SCREW, TAPPING 97780-50145-00
12 SCREW, PAN HEAD 98580-05060-00
13 WASHER 704-48287-00-00
14 NUT 95380-05600-00

DEC 3 FLUSH SIDE MOUNT

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Below is the parts list for Yamaha 2021 HELM-MASTE DEC 3 FLUSH SIDE MOUNT:

Yamaha 2021 HELM-MASTE DEC 3 FLUSH SIDE MOUNT Diagram
Position No. Part Name OEM Number
1 REMOTE CONTROL BOX ASSY 1 6X9-48A00-00-00
2 PLUG 6X9-48166-00-00
3 ENGINE STOP SWITCH ASSY 6X7-82575-01-00
4 PACKING 2 6X9-4823B-00-00
5 SCREW, FLAT HEAD 98780-06035-00
5 SCREW, TAPPING 97780-06230-00
6 WASHER 701-48287-00-00
7 NUT 1 6X0-48156-00-00
8 BAND, CLAMP 6X9-42821-00-00
9 TUNING FORK MARK 6X9-42697-00-00

DES 1

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Below is the parts list for Yamaha 2021 HELM-MASTE DES 1:

Yamaha 2021 HELM-MASTE DES 1 Diagram
Position No. Part Name OEM Number
1 STEERING ACTUATOR 6X9-42401-00-00
2 REPAIR KIT, 1 6X9-42402-00-00
3 REPAIR KIT, 2 6X9-42403-00-00
4 REPAIR KIT, 3 6X9-42404-00-00
5 REPAIR KIT, 4 6X9-42405-00-00
6 REPAIR KIT, 5 6X9-42406-00-00
7 STEERING ACTUATOR U-HARNESS 6X9-438A0-40-00
7 STEERING ACTUATOR HARNESS 6X9-438A0-00-00
7 STEERING ACTUATOR U-HARNESS 6X9-438A0-30-00
7 STEERING ACTUATOR U-HARNESS 6X9-438A0-20-00
7 STEERING ACTUATOR HARNESS 6X9-438A0-10-00
8 REPAIR KIT, 6 6X9-42407-00-00
9 REPAIR KIT, 7 6X9-42408-00-00

DES 2

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Below is the parts list for Yamaha 2021 HELM-MASTE DES 2:

Yamaha 2021 HELM-MASTE DES 2 Diagram
Position No. Part Name OEM Number
1 SCU SPLIT HARNESS 6X9-8258A-90-00
2 SCU LINK HARNESS 15M-5FT 6GR-81115-00-00
2 SCU LINK HARNESS 03M-1FT 6X9-81115-00-00
2 SCU LINK HARNESS 30M-10F 6GR-81115-10-00
3 END OF LINE RESISTER 6Y8-85371-01-00
4 SCU LINK HARNESS (C) 6GR-81115-30-00
4 SCU LINK HARNESS (C) 6X9-81115-10-00
4 SCU LINK HARNESS (C) 6GR-81115-20-00
5 HELM UNIT ASSY 6X9-615A0-00-00
6 HELM UNIT ASSY 6GR-615A0-00-00
7 TILT HELM UNIT 6GR-6154A-00-00
8 HELM HARNESS 09M-3FT 6X9-8258A-A1-00
9 END OF LINE RESISTOR 6Y8-85371-01-00
10 HELM HARNESS 09M-3FT 6X9-8258A-B1-00
11 END OF LINE RESISTOR 6Y8-85371-01-00
12 EXTENSION, WIRE HARNESS (15M) 6X6-8258A-91-00
13 HELM HARNESS 09M-3FT 6GR-8258A-00-00
13 HELM HARNESS 18M-6FT 6GR-8258A-40-00
14 HELM HARNESS 18M-6FT 6GR-8258A-50-00
14 HELM HARNESS 27M-9FT 6GR-8258A-60-00
14 HELM HARNESS 09M-3FT 6GR-8258A-10-00

IMMOBILIZER KIT

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Below is the parts list for Yamaha 2021 HELM-MASTE IMMOBILIZER KIT:

Yamaha 2021 HELM-MASTE IMMOBILIZER KIT Diagram
Position No. Part Name OEM Number
1 REMOTE CONTROL UNIT ASSY 6X9-86260-12-00
2 XMTR COMP 6X9-86261-10-00
3 CASE COMPLETE 1 6X9-86267-00-00
4 BRACKET 6X9-81948-00-00
5 BAND 6X9-85546-01-00
6 WIRE, SUB LEAD 6X9-82509-10-00
7 BUZZER 703-83383-11-00
8 BOLT, FLANGE 95880-06016-00

JOYSTICK AND AUTOPILOT

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Below is the parts list for Yamaha 2021 HELM-MASTE JOYSTICK AND AUTOPILOT:

Yamaha 2021 HELM-MASTE JOYSTICK AND AUTOPILOT Diagram
Position No. Part Name OEM Number
1 BOAT CONTROL UNIT (QUINT) 6X9-8591T-50-00
1 BOAT CONTROL UNIT (SINGLE) 6X9-8591T-12-00
1 BOAT CONTROL UNIT (QUAD) 6X9-8591T-42-00
1 BOAT CONTROL UNIT (TWIN) 6X9-8591T-22-00
1 BOAT CONTROL UNIT (TRIPLE) 6X9-8591T-32-00
2 GPS UNIT 6X9-88107-00-00
3 PLATE, HOLDER 6X9-8252H-00-00
4 HOLDER, SOCKET 6X9-8255H-00-00
5 HEADING SENSOR 6X9-8A410-00-00
6 CONVERSION HARNESS 6YM-83553-00-00
7 AUTOPILOT PANEL 6X9-8253V-00-00
8 PANEL, SWITCH 6X9-82571-80-00
9 SEAL ASSY 6X9-22480-80-00
10 JOYSTICK ASSY 6X9-482A0-00-00
11 TUNING FORK MARK 6X9-42697-00-00
12 NUT 1 6X9-48156-00-00
13 PACKING 6X9-4823A-00-00
14 BCU HARNESS (MAIN ST) 6X9-82386-01-00
15 CAP 1 (2P) 68V-82582-10-00
16 CAP 1 (6P) 6X9-82582-20-00
17 BCU HARNESS (2ND ST) 6X9-82386-10-00
18 CAP 1 (6P) 6X9-82582-20-00
19 CONVERSION HARNESS 6X9-83553-10-00
20 LED ASSY (PROP LIGHTS) 6ES-83720-01-00
21 PROP LIGHT EXTN HARNESS 20FT 6X9-82586-20-00
21 PROP LIGHT EXTN HARNESS 30FT 6X9-82586-30-00
21 PROP LIGHT EXTN HARNESS 40FT 6X9-82586-40-00
22 BCU HARNESS (QUINT/MAIN ST) 6X9-82386-20-00
23 GATEWAY 6YG-8A2D0-10-00
24 GATEWAY HARNESS 6YG-82521-00-00
25 EKS HARNESS EXTENSION 91M-30F 6X9-82586-10-00
25 EKS HARNESS EXTENSION 46M-15F 6X9-82586-00-00

MFD INTERFACE

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Below is the parts list for Yamaha 2021 HELM-MASTE MFD INTERFACE:

Yamaha 2021 HELM-MASTE MFD INTERFACE Diagram
Position No. Part Name OEM Number
1 MFD INTERFACE 6YM-8A2D0-10-00
2 CAP 1 6YM-83956-00-00
3 CAP 2 6YD-83957-00-00
4 MFD INTERFACE 6YM-8A2D0-02-00
5 CAP 1 6YM-83956-00-00
6 CAP 2 6YD-83957-00-00
7 XMTR COMP 6YM-86261-00-00
8 COVER, BATTERY 6YM-82129-00-00
9 KNOB ASSY 6YM-8432M-00-00
10 CRADLE ASSY 6YM-60BJ0-00-00
11 CONVERSION HARNESS 6YM-83553-10-00
12 FUEL TANK WIRE 6YM-8356N-00-00
13 HDMI CABLE 6YM-8533A-00-00
14 GATEWAY 6YG-8A2D0-11-00

SWITCH PANEL 1 EKS, SINGLE

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Below is the parts list for Yamaha 2021 HELM-MASTE SWITCH PANEL 1 EKS, SINGLE:

Yamaha 2021 HELM-MASTE SWITCH PANEL 1 EKS, SINGLE Diagram
Position No. Part Name OEM Number
1 PANEL SWITCH ASSY 6X9-82570-00-00
2 PANEL, SWITCH 6X9-82571-00-00
3 SEAL ASSY 6X9-22480-00-00
4 PANEL SWITCH ASSY 6X9-82570-B0-00
5 PANEL, SWITCH 6X9-82571-20-00
6 SEAL ASSY 6X9-22480-20-00
7 PANEL SWITCH ASSY 6X9-82570-70-00
8 PANEL, SWITCH 6X9-82571-70-00
9 SEAL ASSY 6X9-22480-70-00
10 LANYARD, STOP SWITCH 682-82556-00-00
11 EKS HARNESS 6X9-82716-21-00
12 BUZZER 703-83383-11-00
13 CLAMP 90465-13M39-00
14 RELAY ASSY 6X9-81950-00-00
15 EKS HARNESS 6X9-82716-60-00
16 BUZZER 703-83383-11-00
17 CLAMP 90465-13M39-00

SWITCH PANEL 2 EKS, TWIN

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Below is the parts list for Yamaha 2021 HELM-MASTE SWITCH PANEL 2 EKS, TWIN:

Yamaha 2021 HELM-MASTE SWITCH PANEL 2 EKS, TWIN Diagram
Position No. Part Name OEM Number
1 PANEL SWITCH ASSY 6X9-82570-10-00
2 PANEL, SWITCH 6X9-82571-10-00
3 SEAL ASSY 6X9-22480-10-00
4 PANEL SWITCH ASSY 6X9-82570-B0-00
5 PANEL, SWITCH 6X9-82571-20-00
6 SEAL ASSY 6X9-22480-20-00
7 PANEL SWITCH ASSY 6X9-82570-30-00
8 PANEL, SWITCH 6X9-82571-30-00
9 SEAL ASSY 6X9-22480-30-00
10 PANEL SWITCH ASSY 6X9-82570-80-00
11 PANEL, SWITCH 6X9-82571-70-00
12 SEAL ASSY 6X9-22480-70-00
13 LANYARD, STOP SWITCH 682-82556-00-00
14 EKS HARNESS 6X9-82716-31-00
15 BUZZER 703-83383-11-00
16 CLAMP 90465-13M39-00
17 RELAY ASSY 6X9-81950-00-00
18 DIODE ASSY 6X6-81980-00-00
19 EKS HARNESS 6X9-82716-71-00
20 BUZZER 703-83383-11-00
21 CLAMP 90465-13M39-00
22 DIODE ASSY 6X6-81980-10-00

SWITCH PANEL 3 EKS, TRIPLE

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Below is the parts list for Yamaha 2021 HELM-MASTE SWITCH PANEL 3 EKS, TRIPLE:

Yamaha 2021 HELM-MASTE SWITCH PANEL 3 EKS, TRIPLE Diagram
Position No. Part Name OEM Number
1 PANEL SWITCH ASSY 6X9-82570-00-00
2 PANEL, SWITCH 6X9-82571-00-00
3 SEAL ASSY 6X9-22480-00-00
4 PANEL SWITCH ASSY 6X9-82570-40-00
5 PANEL, SWITCH 6X9-82571-40-00
6 SEAL ASSY 6X9-22480-40-00
7 PANEL SWITCH ASSY 6X9-82570-C0-00
8 PANEL, SWITCH 6X9-82571-70-00
9 SEAL ASSY 6X9-22480-70-00
10 LANYARD, STOP SWITCH 682-82556-00-00
11 PANEL SWITCH ASSY 6X9-82570-B0-00
12 PANEL, SWITCH 6X9-82571-20-00
13 SEAL ASSY 6X9-22480-20-00
14 EKS HARNESS 6X9-82716-41-00
15 BUZZER 703-83383-11-00
16 CLAMP 90465-13M39-00
17 DIODE ASSY 6X6-81980-10-00
18 DIODE ASSY 6X6-81980-00-00
19 RELAY ASSY 6X9-81950-00-00
20 EKS HARNESS 6X9-82716-80-00
21 BUZZER 703-83383-11-00
22 CLAMP 90465-13M39-00
23 DIODE ASSY 6X6-81980-10-00

SWITCH PANEL 4 EKS, QUAD

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Below is the parts list for Yamaha 2021 HELM-MASTE SWITCH PANEL 4 EKS, QUAD:

Yamaha 2021 HELM-MASTE SWITCH PANEL 4 EKS, QUAD Diagram
Position No. Part Name OEM Number
1 PANEL SWITCH ASSY 6X9-82570-00-00
2 PANEL, SWITCH 6X9-82571-00-00
3 SEAL ASSY 6X9-22480-00-00
4 PANEL SWITCH ASSY 6X9-82570-50-00
5 PANEL, SWITCH 6X9-82571-50-00
6 SEAL ASSY 6X9-22480-50-00
7 PANEL SWITCH ASSY 6X9-82570-D0-00
8 PANEL, SWITCH 6X9-82571-70-00
9 SEAL ASSY 6X9-22480-70-00
10 LANYARD, STOP SWITCH 682-82556-00-00
11 PANEL SWITCH ASSY 6X9-82570-B0-00
12 PANEL, SWITCH 6X9-82571-20-00
13 SEAL ASSY 6X9-22480-20-00
14 EKS HARNESS 6X9-82716-91-00
15 BUZZER 703-83383-11-00
16 CLAMP 90465-13M39-00
17 DIODE ASSY 6X6-81980-40-00
18 DIODE ASSY 6X6-81980-00-00
19 RELAY ASSY 6X9-81950-00-00
20 EKS HARNESS 6X9-82716-A0-00
21 BUZZER 703-83383-11-00
22 CLAMP 90465-13M39-00
23 DIODE ASSY 6X6-81980-40-00

SWITCH PANEL 5 EKS, QUINT

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Below is the parts list for Yamaha 2021 HELM-MASTE SWITCH PANEL 5 EKS, QUINT:

Yamaha 2021 HELM-MASTE SWITCH PANEL 5 EKS, QUINT Diagram
Position No. Part Name OEM Number
1 PANEL SWITCH ASSY 6X9-82570-00-00
2 PANEL, SWITCH 6X9-82571-00-00
3 SEAL ASSY 6X9-22480-00-00
4 PANEL SWITCH ASSY 6X9-82570-60-00
5 PANEL, SWITCH 6X9-82571-60-00
6 SEAL ASSY 6X9-22480-60-00
7 PANEL SWITCH ASSY 6X9-82570-D0-00
8 PANEL, SWITCH 6X9-82571-70-00
9 SEAL ASSY 6X9-22480-70-00
10 LANYARD, STOP SWITCH 682-82556-00-00
11 PANEL SWITCH ASSY 6X9-82570-B0-00
12 PANEL, SWITCH 6X9-82571-20-00
13 SEAL ASSY 6X9-22480-20-00
14 EKS HARNESS 6X9-82716-B0-00
15 BUZZER 703-83383-11-00
16 CLAMP 90465-13M39-00
17 DIODE ASSY 6X6-81980-10-00
18 DIODE ASSY 6X6-81980-00-00
19 RELAY ASSY 6X9-81950-00-00
20 EKS HARNESS 6X9-82716-C0-00
21 BUZZER 703-83383-11-00
22 CLAMP 90465-13M39-00
23 DIODE ASSY 6X6-81980-10-00

SWITCH PANEL 7

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Below is the parts list for Yamaha 2021 HELM-MASTE SWITCH PANEL 7:

Yamaha 2021 HELM-MASTE SWITCH PANEL 7 Diagram
Position No. Part Name OEM Number
1 BATTERY SWITCH PANEL 6X9-82570-A0-00
2 PANEL, SWITCH 6X9-82571-20-00
3 SEAL ASSY 6X9-22480-20-00

For Yamaha Outboard Owners:

To assist you in maintaining and repairing your marine engines, we hope the following resources may be of use:


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