4 stroke muffler problems
06-28-2006 | 10:35 PM
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From: valparaiso, IN
4 stroke muffler problems
I had a Saito 125 loose the muffler several times due to vibration. The last time it loosened up and tore the threads out of the engine where it mounts. I'm putting another one on a profile and a YS 140 on a 73" Sominzini Yak and I'm afraid of having this same problem. How in the world is everyone mounting their exhaust so it does'nt loosing up due to the vibration the 4 strokes make? I really need help here guys so please let me in on the trick to keeping the muffler tight. I'm ready to toss every 4 stroke I own and go to 2 strokes and gas only. In need of some tips here please.
Scott
Scott
06-28-2006 | 11:31 PM
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From: Benton,
IL
RE: 4 stroke muffler problems
Scott, I have been told that a little dab of high temp silicon gasket goop works. I use some goop called "forme-maker" or "gasket eliminator". It is a ford motor company product that comes in a small tube and looks like a thick grape or strawberry jelly. I've been told that it was designed for the installation of sensors on the intake manifold. It only takes a very small amount on clean threads to work. It never hardens completely so it can be removed but it still keeps the muffler/manifold from loosening or leaking.
Fred
Fred
06-28-2006 | 11:32 PM
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From: Macho Grande, KS
RE: 4 stroke muffler problems
I use auto Permatex high temp dark red gasket gell. It comes in a squeeze tube. Smear on the header threads to engine & muffler then run a little around the header opening on head so some will be carried up into the head. You'll have to wipe off excess after you tighten lock nuts. This has worked for me without fail.
06-29-2006 | 05:31 PM
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RE: 4 stroke muffler problems
Here's an alternative that I've used with great success on my O.S. and Magnum 4-strokes.
Purchase a small can of Rustoleum aluminum brush-on paint (it's even aluminum colored). After cleaning the threads on all the mating surfaces, brush on a coat of the paint on each surface. Let dry. Assemble. The heat of the exhaust system combined with aluminum in the paint creates a good, tight bond.
I agree with MinnFlyer too; make sure your prop is balanced perfectly. But sometimes you just get an engine that shakes. In that case, I fasten the muffler to the fuse to (1) minimize muffler movement and (2) avoid losing it if it comes all the way off.
Mike
Purchase a small can of Rustoleum aluminum brush-on paint (it's even aluminum colored). After cleaning the threads on all the mating surfaces, brush on a coat of the paint on each surface. Let dry. Assemble. The heat of the exhaust system combined with aluminum in the paint creates a good, tight bond.
I agree with MinnFlyer too; make sure your prop is balanced perfectly. But sometimes you just get an engine that shakes. In that case, I fasten the muffler to the fuse to (1) minimize muffler movement and (2) avoid losing it if it comes all the way off.
Mike
06-29-2006 | 06:34 PM
#7
RE: 4 stroke muffler problems
ORIGINAL: mirwin
Here's an alternative that I've used with great success on my O.S. and Magnum 4-strokes.
Purchase a small can of Rustoleum aluminum brush-on paint (it's even aluminum colored). After cleaning the threads on all the mating surfaces, brush on a coat of the paint on each surface. Let dry. Assemble. The heat of the exhaust system combined with aluminum in the paint creates a good, tight bond.
I agree with MinnFlyer too; make sure your prop is balanced perfectly. But sometimes you just get an engine that shakes. In that case, I fasten the muffler to the fuse to (1) minimize muffler movement and (2) avoid losing it if it comes all the way off.
Mike
Here's an alternative that I've used with great success on my O.S. and Magnum 4-strokes.
Purchase a small can of Rustoleum aluminum brush-on paint (it's even aluminum colored). After cleaning the threads on all the mating surfaces, brush on a coat of the paint on each surface. Let dry. Assemble. The heat of the exhaust system combined with aluminum in the paint creates a good, tight bond.
I agree with MinnFlyer too; make sure your prop is balanced perfectly. But sometimes you just get an engine that shakes. In that case, I fasten the muffler to the fuse to (1) minimize muffler movement and (2) avoid losing it if it comes all the way off.
Mike
