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Soooo, with k&n 0990 pods and my 300 cc motor, pump gas (non ethanol), keihin 115s were way rich at Road America 1000 ft elevation 90 degree tenps and high humidity. I switched to 110s and it was better but still rich. Ive got leaner jets ordered .
Looking thru the jetting dbase thread, it seems a lot of 250s ended up with 108s when using the K&N pods. Im guessing air filters are the most important item when it comes to jetting and displacement matters not so much.
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