150 main ??

2strokepower

New Member
Aug 10, 2009
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i have a 150 main how many sizes do i need to go up with a fmf expansion chamber,need to know by tomorrow thanks.
 
right now its perfect pancake color(plug),i will try the 160.anybody else have any thoughts on this?
fix:just checked the plug and its black,plug was brown when i got it???
 
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ok but i dont think they have a 151 jet for this carb,hell i might not even need to rejet i just checked the plug and its black.
 
oh ok i'll call yamaha and see if they have them for my carb.will other jets from other aftermarket carbs work just in case they dont have them? sorry for being a pain in the ass but i dont want to rebuild my top end anytime soon.