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Honda MX & Off-Road Dirt Bikes
03 cr250 head mod
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[QUOTE="jmics19067, post: 665084, member: 27963"] raising the compression might increase the power from low to mid at the possible expense of losing top end. I don't believe port hieght will affect detonation too much since compresion is after the fact of the ports being closed by millingthe head. How the ports are shaped and the airflow of the intake in the combustion chamber might. the shape of the combustion chamber will. the only benefit of polishing your ports is that it will look pretty in your hands whne you do a top end . I believe it might help to keep carbon from sticking in the exhaust port, otherwise basicly a wasteof time and effort. If you want to experiment on increasing the bottom end and your cylinder and engine cases are in great shape, you can try removing the base gasket. Use a gasket sealer that will work for yamaha and kawasaki crankcase halves instead. If your squish clearance is still good on the head and you like the way the bike feels you should be able to safely cut off the crushed thickness of the base gasket off of the bottom of the cylinder. This will lower the ports and increase compression. All you would have to do is use two base gaskets to bring it back to stock spec.If you didnt like the way the bike feels or you run into other problems don't cut the cylinder and put the gasket back in . I have used permatex#2 instead of a base gasket for probably about 20 hrs till I smoked a top end from other reasons.Didn't realize I damaged a radiator hose one ride and cooked it. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
03 cr250 head mod
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