DetailsPilot jets for 21 to 28mm carburetors from PWK/Koso . In some cases, the pilot jets may be too small or too big, which you can see from the scooter's throttle response. If you start the engine but only manage to ride about 10m at walking speed, then the pilot jet is too small. If the engine splutters up to about 1/4 of the throttle, the pilot jet is too big.
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Name Carburettor Pilot Jets PWK / Koso 40 Item No. KH-ND-40 Brand Keihin Jet Size 040