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2001 Bombardier DS 650 Jetting ?'s...any suggestions/opinions

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whats up guys just wanted to get some opinions on jetting. My bike has a fmf powercore 4 slip-on, k&n air filter with prefilter, and I have been running the bike with the lid off. Ever since i added the k&n filter and ran the bike with the lid off it sounds like the bike has been running a bit lean. I put the lid back on and it seems a little better. The previous owner had told me there was a jet kit installed but the guy was definitely a tool so Im not taking his word for it. I havent had a chance to take the carb out and check the jet sizes but I'd like some opinions on what jets I should run with the add-ons. I also plan on adding a revbox and a few other goodies. Any opinon's or suggestions would be great. Thanks

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Do you know how to read plugs? If not, do a search on the net on how to read spark plugs. Your plugs can tell you a lot about if your engine is running lean or rich. It's not perfect but it will get you in the ball park. Other than that a dyno tune is really going to be the only way to get the fuel/air ratio perfect.

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I added the year make and model to the thread title, please be sure to include these things when creating a new thread here in the branded forums.

I would get the next few larger pilot and main jets, maybe 3 or 4 of each, and start guessing and checking. Start with the main jet, once you have that dialed in, fine tune it with the needle clip, pilot jet and pilot screw adjustments. One thing at a time is best, so you know what each thing has done.

Edited by DirtDemon
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