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Discussion Starter #1
This engine is about 3 years old. Suddenly while mowing at full throttle the engine sound changed. Bring it back to idle it sounds like an exhaust leak (puff, Puff) but also when you bring it down from full throttle to idle it backfires. It seems to have power still. I wouls appreciate any thoughts.
Thanks, EdnPa
 

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Maybe a head gasket is going?..could be an exhaust leak too,blown gasket at the muffler where it bolts to the engine,or a muffler thats got a hole in it perhaps..
 

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Muffler broken off, muffler blown out, broken flange...common on courage engines.
 

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Discussion Starter #4
You are right on. The flange in the muffler was broken off and dropped down into the muffler. We ground the bent over lip off the muffler to separate it, repaired the flange and welded it back together. Not the prettiest but it works.
Thanks for the help, EdnPa
 
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