I have a 86 lt250 and it has a bills pipe and silencer on it that the previous/original owner said the pipe has been on since the early 90's. It does have a little carbon buildup in the end going into the mid pipe but i f its been on 20+ years it doesn't seem too bad. Here's my question is there a lifespan on pipes? Any ways to clean the carbon? Would a new FMF outperfom my bills pipe? Does any pipe silencer come with a new midpipe?

I tried oven cleaner degreaser nothing seemed to get the build up off. I was using a flat head and a Lil hammer to break it off .

I'm not sure how it works on carbon build up but toilet bowl cleaner works GREAT on the outside to get the rust and other built up oil off, might try it on the inside.

If you do let us know how it worked.

I removed my silencer, ran the motor, and I noticed it was blowing out black liquid.  Am I using too much oil in my gas?