Backfiring in Cat Conv?

[PilotPhil]

I just purchased a used K1200LTC with about 65,000 miles on it. The seller reports that he had a problem with fuel backfiring in the cat conv while the engine is cold. I am finding that it "backfires" or rattles, or SOMETHING not only when it is cold, but all the time...not only when I let off the gas, but while accelerating, particularly between 3000 and 4000 RPM. Anybody have a similar experience...and hopefully, solution???????

[murray]

I just purchased a used K1200LTC with about 65,000 miles on it. The seller reports that he had a problem with fuel backfiring in the cat conv while the engine is cold. I am finding that it "backfires" or rattles, or SOMETHING not only when it is cold, but all the time...not only when I let off the gas, but while accelerating, particularly between 3000 and 4000 RPM. Anybody have a similar experience...and hopefully, solution???????
Phil sounds like the cat conv broke free inside the collector. I had the same experience. You may note eratic idyl . A cheap fix is to remove exhaust and open up the collector from the top and remove the cat then reweld (stainless). I am not sure how the bike will run after removing the cat.You may lose some low to midrange power.

[PilotPhil]

Thanks, Pete. I have a neighbor who has the ability to weld stainless. That sounds like a good starting point. It doesn't seem to affect performance, but is very annoying, especially when on such a smooth running machine.