Author Topic: Replaced piston/cylinder now won't fire  (Read 1080 times)

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Offline 3000 FPS

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Re: Replaced piston/cylinder now won't fire
« Reply #40 on: December 07, 2013, 09:46:40 pm »
If it were me I would check the squish on the saw at this point to make sure what you installed are the correct parts.   

You remove the spark plug, then take a piece of solder like you would use for soldering electrical things, and then put the solder through the spark plug hole and bend it so that it touches the cylinder wall.   You want to have the solder facing out toward the sides of the saw and not from front to back.   Then grab the flywheel with your hand and crank it over until is smashes the solder.  Then back it up to smash it again.   
Remove the solder and then measure the very end of it to see how much room there is between the cylinder top and the piston top.   It could be let say some where around .050"s to .035"s.   If there is an excessive amount it will make the compression low and could be the wrong piston.   But you have to measure it to see.
PP 505, 475, 445.

 

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