What would be the best way to plug one of the outlets on the pitts style muffler? I have an OS 50SX that was not creating the right back pressure. Any ideas on this? Thanks....

I recently had to do the same thing and was given several excellent ideas. The easiest (and least reversible) is to simply crimp the end of one of the tubes closed with a pair of pliers (I went with this as I needed complete blockage for correct pressure levels and I used a piece of exhaust deflector over both tubes so you can't even tell there's a crimp). If you're going to go this route, I would suggest leaving enough of the pipe uncrimped to be able to cut the crimped end off later if necessary.

You can also cut a wood dowel or metal rod to fit snugly in the pipe and then drill holes for screws to hold the dowel/rod in the pipe. If you don't need complete blockage to get the correct pressure level, a hole can be drilled in the dowel and enlarged as is necessary.

Some folks suggested plugging the pipe with JB Weld, but there was some question as to how well it holds up to the heat and oil/fuel. A plug could possibly also be made of high-temp silicone gasket maker (RTV) squirted into the pipe and allowed to cure, but there was also some question as to how long this will stay in the muffler.

If you only need partial blockage, you can use steel/copper wool stuffed in the pipe, but that has a tendency to come loose and to collect oil residue which eventually congeals and blocks the pipe even more. I don't recall how it was suggested to secure it more permanently.

I hope these ideas help...good luck

Dave

Thanks for the reply Dave. That helps alot.......