Originally Posted by
Brian P
IIRC this is a carb engine. The carb will kinda-sorta respond to more airflow through it by drawing more fuel through the same jet. As a first guess and in the absence of any real-world experience, put in a main jet a couple sizes bigger and see what happens. Get it checked on a dyno with exhaust-gas analysis pronto, though. On that hard-working air-cooled engine, you do not want a lean condition under heavy load, but too rich is no good, either.
edit: On poking around, it appears that Kymco uses Keihin CVK carbs, which plenty of Honda and Kawasaki bikes also used before switching to fuel-injection. Haven't found what that specific bike uses but other similar models seem to use those. You can get Keihin carb parts anywhere. Maybe ask the vendor if he has any jetting suggestions. Jets are a few bucks each, here.
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