cherry red muffler

exmarFebruary 25, 2012


Got an email from a buddy in RI who is doing some "head scratching" over a Kawasaki, 18 HP, 2 cylinder PROPANE on a big buffer. Muffler runs cherry red. He's changed both coils and plugs, checked compression, air cleaner was changed recently. From the little I know, sounds like the classic "running on one cylinder" and unburned gas getting dumped into exhaust. However, propane isn't something I'm familiar with. He routinely works on these and when he saw it, he immediately changed the coils and plugs as that is the "classic" fix. Bad coil out of the box? He still has an inductive timing light and I suggested he try that to verify both plugs are firing.

Sorry, no model numbers.

17 here today, 50's by monday, this is winter?


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Check the valve clearance for proper specs. That has been my experience with some 4 cycle engines exhaust valve stretched or burned. It could be a bad exhaust valve causing a loss of combustion gases. loger

    Bookmark   February 25, 2012 at 10:57AM
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It's running too lean.

    Bookmark   February 25, 2012 at 1:40PM
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Have him check his spark plugs (white or light tan colouration) one or both cylinders are running overly Hot . I concur with Bill that probably a lean condition is basic cause. He may have a gasket problem on the intake system .

    Bookmark   February 27, 2012 at 9:21AM
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I have seen a cherry red exhaust manifold on a 4 cyl fuel injection Volvo system due to a lean mixture after replacing an engine and the mixture h/n been adjusted. Otherwise, I have see it on small 4 cyl engines related to bad valves or valve adjustments. Good Luck! loger

    Bookmark   February 27, 2012 at 6:20PM
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Thanks for all the good infor. I've passed it along.

The good news is he has it working and it has gone back to the WalMart Super Center who owns it. The manager is very unhappy to pay him the $65 an hour, but his automotive folks can't fix it.....:-)

It all came down to valve adjustment. I'll quote from his email:

Conflicting opinions from two propane manufacturers, 5 and 7 thousandths from Onyx and 9-10 on both valves with aztec. Went back to 5-7 on the wet side (one piston had an oily residue) the other side was left at 9 and I'm not touching it!!! It's now running fine, no more cherry muffler. Wallyworld was also told they can call someone else next time unless my company takes over the routine maintenance. FAT CHANCE. The whole thing makes no sense to me!!!

Thanks for all the information. Just wanted to tell you how the story ended.


    Bookmark   February 28, 2012 at 3:28PM
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