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Compression Guage


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I like to try to do both. (the cold and warmed up readings) And holding the throttle open will get some fuel and oil into the cylinders, and also let air into the motor to make the compression. And yes, like mentioned before, kick it over untill the needle stops moving. Mine stops moving at 195 or so...

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I like to try to do both.  (the cold and warmed up readings)  And holding the throttle open will get some fuel and oil into the cylinders, and also let air into the motor to make the compression.  And yes, like mentioned before, kick it over untill the needle stops moving.  Mine stops moving at 195 or so...

I'll thinking the opposite boonman. Holding the throttle open with such little air flow (not running just kicking it over) doens't allow as much fuel to flow. There is less vacuum when you hold the throttle open. It also allows more air to compress.

 

To test your rings, do the test cold. Take your reading. Then put a table spoon of oil in the cylinder through the spark plug hole and test again. If there is a significant increase in compression, you need to fix the problem.

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To test your rings, do the test cold. Take your reading. Then put a table spoon of oil in the cylinder through the spark plug hole and test again. If there is a significant increase in compression, you need to fix the problem.

 

Really... :huh: ...good to know. ;) Last time I checked mine shee was cold & I had 150lbs on each cyl...I let each side hold the 150lbs each for 3 min....figured shee's good to go. :)

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How in the heck did you get the cylinder to hold compression? The gauges are made to not let air back out anyway. I'm a little confused on that one led.. :blink:

 

Well, if you compression is low and you put oil in it and the compression becomes a normal number then your rings are the problem. As far as the oil, it's probably best to use whatever you run with your fuel.

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