edmoor

My Feedback: (1)

cant keep the muffler tight.....only has a single thread into the head....with a jam nut. i tried high temp. thread locker....still comes loose. cant hardly attatch a strap to the firewall as its fiberglass....and will get too hot. my option im considering is to make a strap and attach it to the engine. anyone else have a better solution for this loose muffler problem?

jay2000dakota

try high temp RTV silicone on the threads or a muffler system from Macs Products

red head

Get longer bolts !!!! ENJOY !!! RED

AviationNut

Try tightening the nut when the engine is hot.

edmoor

My Feedback: (1)

you dont understand......there are no bolts.......just a pipe with a jam nut. im searching for red rtv ht silicone......cant find it at hobby stores......will check tomorrow at parts stores. in my opinion.....this is a bad design on this muffler setup to begin with, it can only come loose afew times.....and what few threads are in the head will gone......as the pipe is steel.....and the head is mag. or aluminum. i wont buy another engine that dont have a bolt on manifold rest cast into the head. the one pipe method is simple.....but just dont hold up.

oldvet70

My Feedback: (10)

If the pipe is only 1 thread in the head it will never stay tight. It must be threaded in much farther than that, at least a 1/4 inch or it's just going to continue to vibrate loose. The design is sound you just need to screw it in farther.

jay2000dakota

The RTV Silicone is made By Permatex for cars. Any auto parts store should have it.

Charlie P.

Third vote for the silicone gasket. Otherwise they just loosen up over a few flights.

Conrod

Hi
3 to 4 turns of PTF tape ( white plumbers thread tape) screw the header or muffler up then tighten the lock nut. I use it at the cylinder head thread and muffler to header thread. Works on my OS, magnum and YS four strokes.
Geoff

Steve Percifield

My Feedback: (14)

Screw the jam nut back up the header to expose more threads. Then Screw the header into the engine head using the Teflon tape. Screw it in as far as it can go, then tighten the jam nut.

Rudolph Hart

Short thread it's mostly to do with how you support the muffler

carrellh

Every four stroke engine I have seen has a screw in header like the Magnum and they can be a pain.

Be sure to screw the jam nuts onto the header pipe as far as possible, as in the picture. Screw the header into the engine until it stops and then back it out only enough to point where you want it. Using high temp permatex rtv or teflon thread tape is a good idea. Tighten the jam nut as tight as you can. Get the engine hot, shut it off, and tighten the jam nut again. That should help it stay tight.

Carrell

shiver

Mine sheared off in flight today[]

MikeL

My Feedback: (3)

This is the solution. It's also known as teflon tape. Works like a charm, without any fuss. No need to torque things so tight that you damage them, either.

daveopam

My Feedback: (9)

I also use the Teflon tape. It does not lock anything down, but instead takes the minute bit of play out of the threads and keeps the muffler from wiggling loose.

David

Tarasdad

Never had that problem with my Saito .80. Muffler never even loosened up in flight and I made sure to check it before and after each flight. Still has the original muffler, although I did replace the header with a new one. Didn't need to, the original was still fine, just didn't look pretty any more. Once I have my Aeromaster built and my Saito in it I'll be checking it every flight again.

bps

My Feedback: (3)

Seems when I tighten my muffler when the motor is hot it stays.

geeter

My Feedback: (110)

use J-B weld on the threads going into the engine. let it set overnite............works for me on my saito 100................RON