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Posted by Vaughn [99.58.160.70] on Wednesday, February 17, 2010 at 22:05:24 :
In Reply to: Cracked piston posted by Robert N [70.184.66.179] on Wednesday, February 17, 2010 at 11:52:29 :
If the piston is cracked, it will have low compression compared to the others. It can also knock. If you suspect one, bring it up to TDC and rig an air hose to the plug hole. Take off the breather cap and pump a 50 pounds of air into the combustion chamber and see if much air flows out the breather tube.