A powerful reliable engine is desirable on two counts, on a boat running against a spring tide, especially when exiting an estuary port, you need every HP you can get; and the other reason; a smooth, quiet running engine without any nasty vibration just makes boating more pleasurable.
The crankshaft and piston/s assembly is perhaps the most fundamental part of the engine and careful attention paid to this area, replacing worn, damaged or defective parts, will help ensure the engine gives its best.
Other related components you may wish to consider:
Add as many items as you wish to the same shopping cart, new gaskets, seals and bearings for example, and still only pay the same single fixed price shipping cost. Pro-workshop gasket sealant, 08C70K0234M to help achieve a professional level of engine building expertise. This component may have other applications within the Yamaha marine engine model range, so please make sure you order the correct part number/s for your application.