Low end to midrange runs off the pilot jet and high end is your mains. Does it seem to have too much gas at low end or to little? If it ran fine last year i would just think that you have some bad gas or a partially plug jet. Try cleaning your carbs and check how well the needle valve is seating.
sounds like its toward the mid range. clean the needle jet, its what the jet needle rides in, and it easily clogs and its hard to clean. take out the main jet and then pull the top off the carb and carefully pull the needle jet out of the top with a needle nose pliers. Don't twist it ,just pull lightly. dont bend it !Put it under a bright light and look inside for crap. Use carb cleaner or acetone and compressed air. You know , ALL sledheads need to know how to do carb cleaning cuz it causes more trouble than anything else on a sled. Let me know what you find!!
Good info spaceman but the needle jet just maintains a steady amount of fuel in the float bowl. He said that top end was the best part of the whole powerband, so this means he is getting fuel. needle jet passages are just from the fuel line to the float bowl, no where else.
No , not the needle and seat ,I'm talking about the needle thats attached to the slide which is attached to the throttle cable and regulates fuel through the main jet from partial throttle to wide open when the main is regulated by its size
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