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Briggs 6.5hp muffler glowing cherry red

4968 Views 4 Replies 3 Participants Last post by  remauto1187, 
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Briggs and Stratton 6.5hp 121332 Intek I/C brand new replacement engine for my tiller. The original was a 6hp that decided to tear up the rod at the crank. The new engine has about 1.5hrs engine time on it now. The muffler I noticed today while tilling is glowing cherry red. About 50%+ of the muffler body and down the pipe leading toward the head.

Major lean condition? If so why? Brand new engine and all.

Anyone have any ideas and troublshooting procedures to diagnose this condition?
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30yearTech
It's not unusual to see a muffler glow on a small engine, especially in subdued light or dark. This phenomenon is due mostly to the proximity of the muffler to the cylinder head. Exhaust gases are extremely hot and there is little room for cooling in the exhaust system before the muffler.

I doubt there is anything to worry about on your new engine.
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