1991-1993 Yamaha Exciter II-570 Service Manual, Page 51Get this manual

1991-1993 Yamaha Exciter II-570 Service Manual, Page 51

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CARBURETOR TUNING
3 Themainjetshould be adjusted onthe basis of the following chartStandard Main Jet: #310

AWARNING
Never remove the main jet cover while the engine is hotFuel