i did the math and the exct commpression is 183.75 psi
I have a 2002 Yamaha YZ250F and I run with 13 psi in both wheels. It works for me. Yamaha probably recommend a higher pressure but 13 psi is plenty.
87 - 04 compression standard 121 psi minimum 114 psi max 128 psi
120 psi minimum
480 psi minimum
Normal compression on a gasoline engine is about 125 psi.
200 psi
The book says Standard: 121 psi (850 kPa) Minimum: 114 psi (800 kPa) Maximum: 128 psi (900 kPa) but this is for at sea level, not sure what it is supposed to be at any where else such as at 5000 feet which is what I am trying to figure out.
then youre running about 8.5:1 compression
251.37
"600 psi" is not a compression ratio; it's a pressure. For a RATIO, you need to compare TWO different numbers.
Engine compression psi? Radiator cap psi? Engine oil pressure psi? Tire pressure psi? Fuel pressure psi?
With a compression gauge.