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2001 TRX350 Rancher jetting


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I have a stock 2001 TRX 350 rancher 2 wheel drive. Been going rockcrawling on it and have had backfiring on downhills. Pulled carb and went from stock 130 main jet to a 142, replaced slow jet from 42 to a 45, reset the jet needle from stock 3rd slot to 4th slot and have the A/F screw at 3 turns out. Have Uni filter in stock air box. Bike is now hitting rev limiter in all gears, and will pull front wheels off ground. Can go from full throttle to no throttle and not noticing any popping now. My question for anyone, has anyone done similar changes? Any suggestions for other improvements? Don't really want to change exhaust, don't really need any more power and don't want anymore noise, but, would consider a quieter pipe. Also, I see that the thermosensor on this bike is set around 308 degrees, I have noticed that I can ride the heck out of the bike and I don't hear the fan come on. I have tested the fan and just replaced the thermo switch because I thought it wasn't working. Anyone had any issues with this?

Thanks, Anthony

Oh, ride in NW Arkansas, elevations between 1200 and 2000 feet.

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