Pilot Jet - this controls the amount of fuel when idling. Follow the same procedure if your bike runs lean. Once you get used to jetting your carbs you'll be able to easily adjust the air/fuel ratio based on the variety of factors noted above.
From all the symptoms, the scooter behaved like it was running too lean. So, I checked was the filter and found a Briggs and Stratton Filter on it, not an OEM. Does it matter that it wasn't OEM? YES! Although the Briggs and Stratton filter looks similar it has LESS air flow restriction than the OEM. Remember I said it behaved like it was too ...
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Jun 19, 2015 · It is best when setting the main jet to start rich, and come down one step at a time to get it correct. With the main jet ,running to weak will give symptons of if you run on full throttle and slow down, your engine will feel as though it suddenly speeds up a little!
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Pilot fuel mixture screw settings, float level and pilot jet size also affect high-rpm, 0 to 1/8 throttle maneuvers. Too lean, will cause surging problems when the engine is operated at high rpm at small throttle openings! Opening the mixture screws and/or increasing pilot jet size will usually cure the problem.
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Other indications that the pilot circuit is lean are popping or spitting through the carburetor when the throttle is opened and popping or backfiring through the exhaust when the throttle is shut. If the pilot circuit is rich, the engine will have a rough idle or may not return to idle without "blipping" the throttle.
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All stock jetting is too lean for EPA purposes, so you can count on going to a larger main jet and raising the clip position on the stock needle. I have two BRPs, unkorked, stock low speed jet, 172 main, 6 - 1" univents in side panel, Uni air fiilter w/out backfire screen, oem headers with White Bro's e- series S bend slip on with 12 discs.