I bought my son an 2002 scrambler 90 and I can't get it to run right. It wouldn't accelerate at all at first. So I turned both these screws in all the way and backed them both out 1.5 turns. Quad started up and was idling at like 2k. I took turns and tried to adjust each screw individually to see if either one would make it idle down to acceptable speed but neither screw seemed to do anything. I took it for a ride and it was fast but backfired every time I let off the gas.
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