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Need jetting help! Stalling off revs!

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Im runnning a pancake filter, & BBR pipe. Ive been trying all different types of jets. Seems like the best combinatiopn I have found so far is a 40 idle, 85 main with mixture backed out 1.5 turns and 1mm washer under needle. The only problem I have found is it stalls sometimes when it comes off a rev back to idle. Any thoughs? comments? I found it runs too rich with a 90/40 combo blowing black smoke and black spark plug. Im at sea level in florida ~70degrees.

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Hey man i tried every jet and needle combo i could the best i got was a 42p and a 90 main, but mine still didnt want to rev out good. I got tired of messing with it and bought the 26mm bbr carb kit and it runs great now.

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