I'm stumped. My son's '97 CR80 has only 60psi of compression even after a rebuild & break-in. There is no spec in the manual, but I'm convinced this is too low. It's all stock except for Boyesen reeds. Piston, ring, & gaskets are all Honda, and the cylinder looks good. Porting is also stock. Putting a little engine oil in the cylinder when testing doesn't raise the readings, either. tried the gauge on several different motors and there is nothing wrong with the gauge. This thing's been running rich since we got it a year ago even with a #122 main and the stock needle with the clip in the top groove. I think it's running rich due to the low compression. The only fix I can think of at this point is to machine the head to raise the compression back up but I don't want to do that until I'm sure all other possibilities are exhausted.:think