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Old 02-20-2010, 08:08 PM
solomon solomon is offline
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Default 10Hp tecumseh Cherry Red MUFFLER!

ok so my tecumseh 10hp runs excellent, but its muffler turns cherry red. i know first thought is the engine is running lean, but, the carburetor is nonadjustable. What do i do? I can get pics up in a few days
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Old 02-20-2010, 08:09 PM
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check the plug
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Old 02-20-2010, 08:14 PM
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its brand new, im stumped
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Old 02-20-2010, 08:15 PM
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there has to be a idle adjustment.
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Old 02-20-2010, 08:20 PM
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Nope, thier is nothing at all, its the weirdest thing ever. never seen a carb like this in my life. i'd take pics but my camera died, so its gonna be a few days for the new 1 in the mail
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Old 02-20-2010, 08:21 PM
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Clean the carb, probably have semi clogged jets. is it cold where you live? colder it is the leaner it runs.

What freakboy meant by check the plug was to do a plug chop to see if it was indeed running lean (which it sounds like it is).
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Old 02-20-2010, 08:29 PM
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i will try and check the plug tomorrow when i have "some light", its hard to get to it on a generator. The carburetor is VERY clean, it was surging so i cleaned it and rebuilt it and now it runs perfect. Just turns my muffler cherry red
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Old 02-20-2010, 08:30 PM
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plug chop consists of warming up the engine and killing it at the desired range taking the plug out and examining the color and texture
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Old 02-20-2010, 10:06 PM
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Quote:
Originally Posted by solomon View Post
ok so my tecumseh 10hp runs excellent, but its muffler turns cherry red.
Did this problem start when you installed a race type air cleaner/header or maybe disconnected the Governor?

If your spark plug electrode/insulator is a white-ish color you'll know your running lean.
Black/sooty=overly-rich, nice tan color = pretty darn close.

If your running lean, (and even if your carb doesn't have any external adjustments) you could still drill out your main jet in very small increments, and then take another plug reading each time until you reach that nice tan color.

Try to take your plug readings after you've warmed it up, and then rode the kart to full top speed for 5 seconds or so, and then suddenly hit the kill switch and coast it on in.

I'm guessing your carb was jetted extremely lean to meet EPA standards.

If your spark plug reading looks good, maybe your muffler is just overly restrictive from some assembly defect or other possible reason.

You could also make sure your air cleaner isn't just plugged up/defective, and your full of the correct weight of oil Tecumseh recommends for your engine. (if it says 30wt, don't use 10-30 and visa versa)
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Old 02-20-2010, 10:39 PM
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This is on a Generator, governor hooked up, no aftermarket filter, Just got the engine running its been sitting. After about 2 minutes the muffler turns cherry red, and a backfire too after it turns cherry red. i really down want to drill the main jet and ruin it. It has the right amount of oil.
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Old 02-20-2010, 11:53 PM
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.... i wonder if the exhaust gasket is letting in more air and its burning more completely in the header
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Old 02-21-2010, 12:24 AM
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actually the engine has no exhaust gasket, i removed the muffler from a donor engine and it had no gasket, im going to try using a threaded muffler tomorrow. Thanks for the idea turtleMann
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Old 02-21-2010, 11:00 AM
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the muffler could be clogged. when catalytic convertors get clogged, they turn cherry.
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Old 02-21-2010, 11:43 PM
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yep if the spark plug color is good it must be the muffler and mabby because of no gasket
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Old 02-21-2010, 11:52 PM
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yea i didnt get around to checking on it today, maybe tomorrow. i really dont want to have to drill the jet
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Old 02-22-2010, 12:20 AM
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Have you had the head off or done a compression check? We know the EGT is too high, but why? I can think of 3 things off the top of my head (aside from the lean mixture or plugged exhaust ideas mentioned above).

1) Ignition timing. Is the timing adjustable, and is it adjusted right? If the timing is retarded the combustion may still be happening when the exhaust valve is starting to open.

2) Cam timing. Not sure how many degrees of cam timing 1 tooth is, but if your cam is advanced 1 tooth I'd imagine the engine would still run (maybe not well), but it would be the same situation as above where some of the combustion is still happening in the exhaust system.

3) Do you have a burned valve? Check the compression, do a leakdown test, or take the head off and make sure the exhaust valve is keeping the fire in the cylinder.
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Old 02-22-2010, 03:05 AM
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I had a valve job done because it only had 45 psi, and now its up to 95 psi. The ignition timing is adjustable, UNDERNEATH the flywheel with points =( . I have a feeling this other muffler im gonna try is gonna do the same thing. i know the cam isn't off and obviously a burnt valve is out.
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Old 02-22-2010, 09:45 AM
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What kind of generator has points ignition and a non adjustable carb? My old man has a fairly modern tec 10hp on a generator, its a nice one made for Coleman with a cast iron cylinder liner. The engine has a fully adjustable carburetor and electronic ignition.
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Old 02-22-2010, 05:14 PM
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Its a GENERAC brand generator. the real question is, who in thier right mind puts a Tecumseh engine on a generator lol. Im About to go look at the motor, check the plug and swap the exhaust, im going to take pics of the carb aswell
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Old 02-22-2010, 07:58 PM
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you said that it runs exellent, but the muffler turns cherry red.

I would just guess that its the mufflers problem. time for a new one?
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