xr650l backfires

Hi I have 93 650l which seem to backfire when decelerating. I see this is a common problem, but I cannot seem to find who sells jetting kits for this. Have any advice?

Corky

P.S. the jets in the carb looked like the day they were installed!

Check out Dennis Kirk. I think they sell dyno-jet kits. Either that, or ask one of the jetting guru's here on the website.

Backfiring or "popping" in 650Ls is caused by 2 things. Lean jetting in the pilot circuit, and the air injection system, or "smog pump". Baja Designs sells a block off kit to eliminate the smog pump. That alone will remove much of the backfiring. You do not really need a jet kit (unless you want one). You can get individual jets from Sudco.com, or carbparts.com. I went one step richer on the pilot and main jet, to a #52 and #155, and the bike runs great. No bacfiring, no hesitation.

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