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Mercury 40-50hp Starter Motor (OSSM556)

Genuine Part # : 50-55601A2, 50-38890A1, 50-55601, 18-5601

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  • 1 YEAR


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10 tooth starter motor.

This part replaces part #: 50-55601A2, 50-38890A1, 50-55601, 18-5601.

This part suits the following engines: Mercury 40hp 2 Stroke 2 Cylinder 1970-1972 (suits USA serial # 2874704 to 3336257), Mercury 40hp 2 Stroke 402 Model 1972-1983 (suits USA serial # 3336258 to 5552630 & AUS serial # 8052125 to 8064750 & up), Mercury Mariner 50hp 2 Stroke 4 Cylinder 500 Model 1961-1976 (suit USA serial # 1421113 to 4357639 & AUS serial # 8030090 to 8063984).


About The Brand

Outboard Spares brand of parts are tested in Australia's harsh marine environment with a focus on quality and durability. Outboard Spares parts are used by professional fishermen who depend on their parts to stay on the water and in business. So next time you service your engine choose what the professionals use, choose Outboard Spares.

Standard Shipping is FREE on all orders or Express Shipping is $10 flat rate.

Oils & Lubricants can only be sent via Standard Shipping.

Pick up is available from our warehouse at 1/84 Brunel Road, Seaford VIC 3198 between the hours of 8:30am to 3:30pm weekdays. You will be notified by email when your order is ready for pick up.

Delivery Time

Orders are dispatched same business day if ordered before 3:00pm AEDT. All orders are dispatched from Melbourne, Victoria and are sent via Australia Post.

For delivery time estimates with Australia Post please use their delivery calculator here:

If you have any questions relating to shipping, please contact us by emailing

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