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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Head milling, cylinder pressure, and race gas
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[QUOTE="Rcannon, post: 918512, member: 26263"] 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? [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Head milling, cylinder pressure, and race gas
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