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#63149

Walt Gifford
Participant

Should be about 150 cranking with the throttle wide open but if it’s around 100 it won’t run. Compression gauges vary greatly but it will give you a general idea. If you get a rebuild you can use that gauge to develop your own numbers compared to a new ring.

Gif

FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience