My bonestock Raptor at high rev's or when choppin the throttle will backfire and blow the carb boots or airfilter foam off. I'm talking Bonestock - at sea level or 600'...

Did Yam ship the Raptor lean (like Honda did on the 400EX etc)? If so whats recommended? Do I need to rejet the stock motor or make adjustments?

I know the airfilter system is lame, just waiting for K&N and Proflow to actually ship parts (been on back order). But on the boots blowing off what's the fix?

Thanks,
-Brad D-

 

This issue has been beat to death in this forum already. Do a search on keywords like "blown" or "carb".

Here are two that I found:

http://forums.atvconnection.com/thre...rigpost=164601
http://forums.atvconnection.com/thre...B=1&TID=195238