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Message: <blockquote data-quote="Mihylo33" data-source="post: 116990" data-attributes="member: 408">Thats premature wear usually to some sort of oil starvation and high heat...Srad could probably tell you more about it than I can... I gave you the jetting chart. now with your aftermarket parts you need more fuel so automatically go up 2 jet sizes than it recomends for temps and sea level but usually just on the main jet. for example it says at 1000ft ASL and 70* run a 406 main (it says 405.7 but round up). add 2 sizes and go to a 408 instead. Next go to your Yamaha dealer and buy regular Yamalube and run it at 32:1 like the manual says.... These arent absolute settings but it will get you close until you are a jetting master.</blockquote>