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i am having some decel backfiring. seems to be getting worse. my stock exhuast came with no gaskets. and i installed a set of cobra speedsters and had it jetted. after about 50-60 miles i retightened them. bike runs great but it's started the decel popping and getting worse. wanted info on par valve temp. block off,and complete removal. and any pro's and con's to doing so. thanks, mike :?