No I haven't tried heat, I was worried about making the metal softer due to heat and or ruining the finish on the pipe
as I am told to get that to work it has to be cherry hot, and i know doing that changes temper of metals, and always makes them softer, and can ruin a nickel finish by getting it that hot
and unless its HOt hot , it really won't work from what i hear!
I am thinking about getting a piece of a plumbers snake, a flexiable metal line more or les and putting it in a drill and spinning it to beat the inside up some, and hope knock some of the carbon build off off, after its been soaking for a few days
its funny,this pipe is terrible inside, and yet the bike runs greatm, and spark plus are super clean too!
I am thinking the guy before me got the pipe off a different bike and just stuck it on here with itr already carboned up like so!
I mean it had/had a solid 1/8 inch + of carbon build up from the heard to as far as i could reach/see all the way around it on the inside!, even at the exit it was coated , just not as thick, but WOW was it in there!
should run a ton better after this gets removed