300ex compression

[bansheexcracer2]

Any body know what the compression should be on a 300ex that is bored 20 over with a fresh top end.

[bwamos]

Depends on what piston you used. Did you use an 11:1 piston, 12.5:1, 13.5:1 etc...

I don't think anyone makes a stock compression aftermarket piston.

[250X_project]

If it is stock Honda piston it has 8.9:1 compression which should give you between 170 ans 199 PSI.

problems running?