I couldn't understand why my RO-Jett 61 cylinder and muffler were turning black! A call to Richard O. and I learned that the muffler end piece (bolts to engine) sometimes warps during welding. Sure enough, it didn't fit squarely to the engine. A bit of lapping with sandpaper on a piece of glass got it flat. Now it seems to fit without leaks. Time will tell for sure.
Floyd
That's even more critical when you use a tuned pipe. Any leaks up near the header joint completely screw up the regulation. Flatten out the surface with 240 grit w/d on a rigid piece of glass or similar, known to be flat. Do all mating surfaces that you can get to. Clean them all up with lacquer thinner, then mate all the surfaces with silicone sealant and *no paper or any other type of gasket *. The gaskets are a complete waste of time and just give something else to leak. The silicone will last eternally, seal any gaps or scratches, and never leak.
If you don't have any silicone sealant (any type will work, including conventional silicone bathtub caulk), use 5-minute epoxy. It will still seal even though it turns black on the outside, and you will be able to get it apart in the future. Don't use J-B weld unless you want to never get it off again.
Brett
Topic: Muffler attach- RO Jett (Read 699 times)