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10 HP engine has red hot exhaust.

I bought a new carb for my 10 HP engine and now when it runs the exhaust gets red hot. The carb is an exact replacement for the original. How can I fix this engine so it doesn't flow red hot. It never did before I changed the carburetor.

Posted by Glen McPherson on

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Brad Brown

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The carb is running too lean and this causes overheating of the exhaust manifold. You need to adjust the carb.

Posted on Oct 18, 2021

Testimonial: "I already got that information off of the internet. The thing is how do I make that adjustment?? It only has one adjustment screw and it says it's for idle adjustment. It's a 10 HP Briggs and Stratton engine working a 5000 watt generator."

  • Brad Brown Oct 19, 2021

    We need information on the make and model of the engine and the carb part number. Did you make sure there are no intake manifold leaks? What altitude are you at?

  • Glen McPherson Nov 20, 2021

    I took apart the carb and removed the main jet. I took some tip cleaning files for a oxy torch and opened the jet up a little. I put it back together and it still got red hot. I removed the carb again and opened up the jet even more. This time when I assembled it all together and started it, it no longer glowed red hot. I ran it for 15 minutes and it didn't glow red. Before after a couple of minutes it would get red hot. So lesson learned. It was lean and just needed the main jet to allow more fuel in the engine. I could have bought a new jet from a dealer but there were like 5 different sizes. They were also $25 each. I wouldn't know which size would of worked. So my ultimate decision was to open the jet myself in a trial and hit or miss attitude. I got it right after 2 tries.

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