I've had good luck with them in a .21. Have yet to try in anything bigger. I purchased a bulk buy from e-bay for the car guys and them seem to work well. Have had some issues with burning out from the car guys but not all of them can tune and some of the same guy's were buying new engines a week later.
Thank's guys I thought this might have been the case no good on the larger engine. I run 45, 67, 80 & 90's think I' will just stick with the K&B'sTested some today myself after seeing this thread, worked decent in my .12 and .21 motors, would not hold a needle on the cmb 45, and would not even idle in the 101 evo 2 motor.
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