It's been 30 years, but as I recall, measuring a two-stroke is
Because of the way it works, the initial pressure in the cylinder
is affected significantly by how fast you crank it.
With a 25cc engine, the volume of uncompressed air in the area
previously occupied by the spark plug threads and the gauge
can be a significant part of the total volume...maybe...YMMV
I stuck the compression gauge in the spark plug hole and pulled the cord
like I was going to start it. It read 60. The carb was off at the time. I
have another identical one that runs fine. I did the same thing with the
carb on and it read about 85 lbs. So is this difference a big deal?
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