Sweet. I did the compression check at sea level. Since then I have gone up 1000 feet. That should lower the compression by about 10 psi according to the cool head chart I saw. The raised exhaust ports will help too. That's great info. It seems to be running great. It will break loose in all 6 gears riding over loose terrain. My shredders are brand new too. I would think that this thing will start chewing through sprokets. Maybe I should invest in those sidewinder sprockets. Maybe get the flywheel lightened as well.