ran good but wont start now

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and that white plastic gear on the inside of the clutch case needs to be removed too.
 
im mixing both. so heres what ima do. ima plug the hole on the right side above the overflow. ima pull the right side crank case off and then take out the white oil pump gear. ima get a new spark plug. im gonna get a gallon of ams oil and run 32.1 pre mix. the if it doesnt run rught im gonna go to my local yamaha store and get a jet kit. size #250. then it should run like a charm. Correct?
 
correct. but what u want to do first is make sure ams oil is ok to run at 32:1 i forgot what oil it is, but one spacific brand of oil is meant at that spacific ratio, and that ratio only. just check the bottle. it should say. and befor u buy a jet kit, do a plug chop. and then buy a jets that u think u will need.