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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Squish bands
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[QUOTE="jaguar, post: 1432552, member: 19340"] final test results with muffler exhaust (not expansion chamber): 160psi standard head 55.6kph 320 degrees 160psi squish head 56.1kph 370 degrees The squish head was run with the most retarded total ignition curve setting. Both heads got the best top speed with the most advanced final curve setting. (It has a custom CDI I adapted from the KDX CDI) I just took off the squish head and measured the squish clearance and it was .82mm. The difference between the two speeds is .9%. So most of the speed increase previously recorded was due to a longer burn (burning the squish-hidden 10% of fuel/air) increasing the exhaust temperature which caused a higher peak rpm of the expansion chambers powerband. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Squish bands
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