View Full Version : 300ex compression
bansheexcracer2
09-25-2006, 08:30 PM
Any body know what the compression should be on a 300ex that is bored 20 over with a fresh top end.
bwamos
09-26-2006, 07:12 AM
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
09-27-2006, 08:40 PM
If it is stock Honda piston it has 8.9:1 compression which should give you between 170 ans 199 PSI.
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