animalmechanic
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- Joined
- Aug 9, 2018
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I blew an 18hp I/C in my mower and replaced it with a 12.5 but put the carb from the 18hp on it because the original was all rusted. It starts easy runs and sounds great but i noticed the exhaust valve stem through where the muffler bolts on so hot it was glowing. I bought a muffler off of eBay and put it on figuring maybe a little back pressure would cool it down. Runs for 10 minutes and cuts out, engine hot as hell. After it cools down the engine starts right up. Oddly enough a buddy of mine has the same engine with the original carb and its doing the same thing. Any thoughts? Mower deck 38" with good spindles, its not struggling to cut.