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Carburettor Main Jet PWK / Koso 138

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Keihin Item no.: KH-HD-138

Carburettor Main Jet PWK / Koso 138

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These jets are the correct ones for all PWK /Koso carburetors from 21mm to 28mm. To set up the carb you usually start with an overlarge mainjet. This will cause the engine to missfire (fourstroke) on full throttle. You then gradually decrease the mainjet in size (in steps of 5) untill the engine starts running properly. Be careful: too small a mainjet will result in a lean mixture and piston seizures.
Additional Information
Name Carburettor Main Jet PWK / Koso 138
Item No. KH-HD-138
Brand Keihin
Jet Size 138

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