PRODUCT DETAILS
40 HP 50 HP Yamaha Outboard Starter Motor – 2 Stroke 3 Cylinder
Premium-quality aftermarket starter motor for selected Yamaha 40 HP and 50 HP 2-stroke outboard engines.
Suitable for selected 3-cylinder Yamaha models from 1984–1988 using the 6H4-81800 starter motor family.
Fits Selected Yamaha Outboards
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40 HP
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50 HP
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2 Stroke
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3 Cylinder
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1984–1988
Starter Motor Specifications
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9-Tooth Starter Drive
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CCW Rotation
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3-cylinder application
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2-stroke application
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High-quality marine-grade aftermarket replacement
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New starter motor
Replaces Yamaha Part Numbers
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6H4-81800-10
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6H4-81800-11
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6H4-81800-12
Also searchable without hyphens:
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6H48180010
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6H48180011
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6H48180012
Hitachi Cross References
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S108-99A
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S108-99B
OEM and manufacturer part numbers are used for identification and compatibility reference only.
Product Features
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Yamaha outboard starter motor
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40 HP / 50 HP
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1984–1988
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2 Stroke
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3 Cylinder
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9-tooth starter drive
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CCW rotation
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Replaces 6H4-81800-10
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Replaces 6H4-81800-11
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Replaces 6H4-81800-12
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Marine-grade aftermarket replacement
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New
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UK stock
Important – Please Check Compatibility
Yamaha produced different starter motors across the 40 HP and 50 HP ranges, depending on engine model and generation.
Please do not order by horsepower or appearance alone.
Before purchasing, please check:
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Engine is Yamaha
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Engine is 40 HP or 50 HP
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Engine is 2 Stroke
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Engine is the applicable 3-cylinder version
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Engine model and year
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Engine serial number
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Original starter motor part number
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9-tooth starter drive
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Mounting points and electrical connections
Your original starter motor should correspond with one of the 6H4-81800 Yamaha part numbers listed above.
If the starter motor looks the same as yours, this does not always mean it is the correct one for your outboard.
If you are unsure, please send SSI Marine your engine model and serial number before purchasing and our technical team will be happy to check compatibility.
Why Buy From SSI Marine?
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Workshop-tested aftermarket & OEM-spec marine parts
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More than 10 years supplying and servicing outboards
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UK stock
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Same working day dispatch before 1 PM Monday–Friday
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Royal Mail Tracked 24
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Collection available from Leigh, Greater Manchester
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Technical support from experienced outboard specialists
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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