Piston Kit, Cast 3-Ring - Yamaha 40-50hp

As low as $55.29
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Cast Piston Kits

This is a very high quality cast aluminum alloy piston. This kit comes with the piston, Riken rings, wrist pin and pin clips.

Standard Bore is 2.638"

These pistons are available in Port and Starboard in sizes STD, .010", .020", .030" and .040" oversize.

To order, select the size desired from the dropdown then enter the quantity and click "add to cart". Most standard and oversize pistons are in stock however some sizes may be on a short backorder from time to time. Please don't hesitate to contact us for assistance.

We also carry the 2-ring version of this piston for the 1989-Up engines. See the "Related Products" tab.



40hp 1984-88
50hp 1984-88

May fit additional models to those listed above. Please DO NOT order based solely on application info above. You MUST compare the oem number of the part for your engine to those listed below to ensure correct fitment of this part for your application! Failure to order this way will likely lead to the wrong part being ordered!

Replaces: 6H4-11631-09-96, 6H4-11631-00-96, 6H4-11636-09-00, 6H4-11636-00-00, 100-260, 18-4143, 18-4141

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