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Motor GREMLIN

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(xr50 Take 88s 18mm Keihin 95main clip down one from center big gun pipe stock head) OH...MY...GOD! I read and understood all the jetting help sites suggested. Please understand the bike runs great at times. I brought it to THE shop. THE "MAN" took it for a many spins and tweaked the air fuel screw a little and said,"who ever built your 88 kit did a great job, and the jetting seems right on." :cry: Five guys around him agreed, me too. Now here I am 30 minutes later, and it's sputtering under throttle and backfiring when I let off! :cry: ANY ideas why it keeps running great then shitty, then great, then shitty, then..... :cry: HELP!

P.S. The problem exists with the big gun pipe. The stock pipe and 85 main has no problem.

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My guess is a peice of dirt floating around in the carb

or...

its running to lean with the pipe on...

Thats my guess.

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That was our first thought also. I have now striped, cleaned, re-jetted, and fliped off my carb at least 15 times over the last week. Thanks though. Gotta check the obvious stuff.

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