Boss, Buffer

The heart of the engine relies on the piston fitting to precise tolerances, no little end movement, and piston rings sealing correctly. Equally important is that the big-end and crankshaft main bearings are showing zero play. If all the above points are addressed, then the engine will give its best, especially if the cylinder -head and valve train has been overhauled.
Other crank and piston related components you may wish to consider:

1VJ1168100
93310635B5
93310635R3
90201356K1
1VJ1165100
1VJ1165101
90201140A6
90201141A3
9330630710
9330630702
1JK1163102Y0
1JK1163101Y0
1JK1163602
1JK1163601
1JK1163801
1JK1161000
34L1161040
1JK1161020
1JK1161040
1JK1163301
1JK1163300
90201301F4
34K1156502
9050122721
2JT1153600
1JK1153100
34K1145400
9310125106
9028205013
9028205065
34K1114500
9017016343
2NX1140001
1XL1140000
2NXW114100
1XLW114100
2NX1142200
1VJ1142200

Don't forget to order all the gaskets & seals required.

Pro-workshop gasket sealant 08CRAHLG120G.

Add as many items as you wish to the same shopping cart, new circlips 9345024028 for example, and still only pay the same single fixed price shipping cost.

This component may have other applications within the Yamaha model range, so please make sure you order the correct part number for your application.