Lowering the needles sounds like a plan. At 1500m the bike starts missing badly at 4500rpm (which is half throttle or a bit more). It seems like it running OK on the primary but when the secondary comes on, the motor doesnt like it. Should I lower both needles or just the secondary. What effect would taking the spark arrestor out have. Im assuming that it will run leaner (stock pipe). Im trying to keep up with a bunch of Honda xr650rs and they have a big horsepower advantage over the XT. The nice thing about the XT is that my stock tank still has fuel in it when their 5 gal tank is empty.
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