For full performance, the engine relies on the Piston fitting to precise tolerances, no little end movement between conrod and Piston and of course Piston rings sealing correctly upon the cylinder bore. 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 it's best, especially if the cylinder-head and valve train have been overhauled.
Other crank and Piston related components you may wish to consider:
Add as many new parts to the same shopping cart as you wish, new woodruff key 9028005001 nut 9017916662 & seals 9310125106 for example, and still only pay the same single fixed price shipping cost.
Important! Please be aware that this component will have other applications within the Yamaha model range, so check the part-numbers you order are correct for your model and application.
Pro-workshop gasket sealant 08CRAHLG120G - easy to apply with professional results.