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Compression test...best place to ground it.
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<blockquote data-quote="JMichael" data-source="post: 395904" data-attributes="member: 7544"><p>At idle, for each cycle of the engine, you get a little bit of air and a little bit of gas into the cylinder for a small explosion and low rpm. At full throttle, for each cycle of the engine, you get a lot of air and gas for each cycle. If you can't get air into the cylinder, what is there to compress? So having the throttle butterfly open (WOT), allows more air to get into the cylinder faster. Yes some air can get in even if the throttle is at idle position, but you'll have to crank the engine over more times to get your reading and even then it may not be accurate. I don't know for sure that it's the same on two strokes, but I've seen times when testing compression on a four stroke wouldn't register max compression even after turning the engine over several times with the electric starter.</p></blockquote><p></p>
[QUOTE="JMichael, post: 395904, member: 7544"] At idle, for each cycle of the engine, you get a little bit of air and a little bit of gas into the cylinder for a small explosion and low rpm. At full throttle, for each cycle of the engine, you get a lot of air and gas for each cycle. If you can't get air into the cylinder, what is there to compress? So having the throttle butterfly open (WOT), allows more air to get into the cylinder faster. Yes some air can get in even if the throttle is at idle position, but you'll have to crank the engine over more times to get your reading and even then it may not be accurate. I don't know for sure that it's the same on two strokes, but I've seen times when testing compression on a four stroke wouldn't register max compression even after turning the engine over several times with the electric starter. [/QUOTE]
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Compression test...best place to ground it.
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