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I have a Tecumseh Sears lawnmower motor that was burning oil. The motor number is 143976600. It was burning oil and needed three plug changes to get thru one mowing of the yard. I decided to tear it apart and try to fix it. I took the piston out and polished the scratches off the sides. I got a cylinder hone and honed out the cylinder till it was clean which really didn't take that much to do. It was clean. The piston doesn't wobble or slap in the bore. I looked at the rings under a microscope a


Answers :

I'm not sure what type of engine you have but you mentioned valves so I assume a 4 stroke. I guess I could go look it up buy my experience is that Sears web site doesn't pack a whole lot of information. But it hit me reading your post that maybe the timing could be off 180 degrees. Could you pull the plug, put it back in spark plug wire, ground to frame and see if it sparks about the same time the piston comes to top dead center?? I don't think this type of engine has a timing chain but if the flywheel has has magnetic pickups on it that fire the ignition could it have been put on wrong? This is just a quess. Sounds like you know what you're doing and the flywheel probably has a keyway but that seems like enough compression to fire and you have spark and gas.
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I have a Tecumseh Sears lawnmower motor that was burning oil. The motor number is 143976600. It was burning oil and needed three plug changes to get thru one mowing of the yard. I decided to tear it apart and try to fix it. I took the piston out and polished the scratches off the sides. I got a cylinder hone and honed out the cylinder till it was clean which really didn't take that much to do. It was clean. The piston doesn't wobble or slap in the bore. I looked at the rings under a microscope a


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