Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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I blew my connecting rod on my Briggs 20hp and replaced

I blew my connecting rod on my Briggs & Stratton 31P977 20hp lawn mower engine and replaced it. Could I have put it on backwards on the crank? The engine is misfiring.

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  • Anonymous Mar 24, 2014

    A craftsman 20HP lawn tractor built 04 08 with a Nikki carburetor will run only on full choke or idle, but dies at full throttle. I have cleaned all passages in carb but, I did not replace any gaskets because none seemed to be torn or frayed. What could be the problem with this engine. The throttle seems to operate from the governor instead of directly to the throttle lever.

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You most likely have a bent or burned valve, if you put it at top dead center and apply some air to the cylinder see if you hear a leak from the intake or the exhaust pipe if you do that will tell you you have a bent valve. hope this helps and thanks for using Fix-ya.

Posted on May 05, 2010

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Yes it is possible to put them in backwards, there are triangles on the rod and crank that have to be on the same side in order for it to be correct. If it is missfiring you also need to check you timing key on the crank. since you broke a connecting rod I would only have to assume that you sheered the timing key as well.

Posted on May 05, 2010

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