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Everything Dirt Bike
Make / Model Specific
Yamaha
1985 Yamaha YZ250
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<blockquote data-quote="ossagp" data-source="post: 202481" data-attributes="member: 1650"><p>If an engine isn't Holding enough pressure long enough, too much of the fuel air mixture gets lost down the cylinder walls and isn't there to be burned. If the compression is too low there is a good chance that leakage will occur when the hot gases are expanding, losing more power yet. The compression test is useful in determining if the rings, cylinder walls and piston are worn to the point that you are losing too much of that pressure and need teplacement. A two stroke will put out about 8-10 times as much pressure on the power stroke as it does the compression stroke. So you see it's important to start high on compression.</p></blockquote><p></p>
[QUOTE="ossagp, post: 202481, member: 1650"] If an engine isn't Holding enough pressure long enough, too much of the fuel air mixture gets lost down the cylinder walls and isn't there to be burned. If the compression is too low there is a good chance that leakage will occur when the hot gases are expanding, losing more power yet. The compression test is useful in determining if the rings, cylinder walls and piston are worn to the point that you are losing too much of that pressure and need teplacement. A two stroke will put out about 8-10 times as much pressure on the power stroke as it does the compression stroke. So you see it's important to start high on compression. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1985 Yamaha YZ250
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