Head milling, cylinder pressure, and race gas

Rcannon

~SPONSOR~
Nov 17, 2001
1,886
0
Guys, I just bought a compression tester today. I just wanted one.

My bike is running perfectly. New cylinder, new piston, and new rings. Broken in for 5 hours.

My maximum cylinder pressure is 160 lbs. It will hold this pressure for hours.

My question is this. How high can I raise this pressure, by head milling, before I get into trouble?

On a 68 mm bore, how much should the head be milled to raise the pressure to 185 or so?

Is there a better way to figure this?

Should I just say screw it and mill .5 mm from the head????

I would love to hear any opinion on this.

My altitude is 4600ft. I understand the pressures are lower here due to high altitude. How much can I mill to bring me back to seal level values?
 
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