jetting big guy. alter the air intake and/or the exhaust and your stock jetting will also have to be altered. i have a similar set up as far as exhaust and filter go and i had to fiddle with my carb for days to get it right. i run 40:1 also and i can run
b8es or b9es and never foul a plug. it was really trial and error with the jetting and to be honest with you i don't remember what i ended up with.
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91 LT250R- Pissed me off and got parted out!!!
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