1992-1993 Yamaha V Max 4 VX750 Snowmobile Factory Service Manual, Page 49Get this manual

1992-1993 Yamaha V Max 4 VX750 Snowmobile Factory Service Manual, Page 49

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CARBURETOR TUNING Main jet selection chart Spark plug color Light tan or grayDry black or fluffy depositsWhite or light grayWhite or gray insulator with small black or gray brown spots and with bluish