1983-1988 Genuine Yamaha Enticer/Excell III 340 Series Snowmobile Service Manual, Page 42Get this manual

1983-1988 Genuine Yamaha Enticer/Excell III 340 Series Snowmobile Service Manual, Page 42

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Trouble Abnormal combustion (Mainly backfire)
Overflow (Relative troubles) Power idling Poor performance at low, mid-range, and high speeds Excessive fuel consumption Hard starti ng Power loss P