1983-1988 Genuine Yamaha Enticer/Excell III 340 Series Snowmobile Service Manual, Page 8Get this manual

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1-7HIGH ALTITUDE TUNING To attain the best performance in high altitude conditions, carefully tune the snowmobiles as outlined belowConfirm STD settings Carburetor (Page 3-3) Ignition timing (Page 6-1

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