Help needed with my OS Max 40SFR engine muffler mount area problem. I can't use the standard OS743 muffler as I broke a chunk off the left mounting hole so I need a bracket style muffler and there isn't any. A OS703 bracket style muffler from a OS Max-H 40R/C engine is too wide to fit the 40SFR mount. Hope someone has a solution.

Since O.S. no longer makes mufflers that would fit the old .40 FSR, we moved this to the general engines forum.

Thanks Bill, for moving my request and hopefully someone out there will offer some suggestions--maybe even using the regular 40SFR muffler (which is somewhat available in the used arena). However, I would have to solve the missing small chunk off the left mounting hole so maybe someone has made such a repair to the threaded socket in the engine mounting area.

Ahh, forgot about the broken lug. If you find one of the regular bolt-on mufflers, you can clean the case thorougly, add a piece of brass tubing that the muffler bolt can fit through, and use J.B. Weld epoxy to hold it to the case. Of course, you could also try to locate a new case, but it may not be worth the money.

If the crankcase itself is damaged.... ouch !

Perhaps look into a MACS one-piece muffler. They sell a strap-on version that may suite your needs.

http://www.macspro.com/onepiece.asp

Or consider a Davis Sound Master muffler. These are available as strap-on as well. You will have to specify an adapter when ordering.
http://www.davisdieseldevelopment.co...r/standard.htm

I hope this is helpful

Bob Brassell

Thanks again Bax and your idea plus the following one is getting me directed.

Bob, very helpful website sources and located an exact answer to a friend's search for a pitts style in-cowl muffler as well. I think I'm on track and sure glad I didn't have to discard this good 40SFR engine at this point.

I have several engines with broken muffler mounting lugs and use the Macs clamp on muffler.

Bill

Thanks to all who suggested places to obtain a strap on muffler. On a whim I logged into Tower and they had just the one at a lower price than the other suppliers.

Thanks to all who suggested places to obtain a strap on muffler. On a whim I logged into Tower and they had just the one at a lower price than the other 2 suppliers.