This isn't really a brake issue, but then it is. I can't be the only one having this problem but I haven't seen anything on it, so far. The problem is that oily exhaust getting on the rear rim and seriously reducing the friction of my brake pads. After every ride I clean the rim with brake wash and the brakes come back until I've gone a couple of miles then the rim is oily again. I'm still in the break in mode and running 16 to 1 but even at 25 to 1 it's still a two cycle and there's always going to be oil in the exhaust. Most engine kit mufflers I've seen have the exit tube pointing down and back and aimed perfectly at the left side of the rim. How much decrease in power or engine overheating can I expect if I extend the exhaust out past the rear of the wheel and aim it to the side? Would 1/2" inside diameter pipe work or should I go bigger. I'm really concerned about noise so a tuned pipe is out of the question. Our neighborhood is quiet and I'm one of the old grouchy guys that got mufflerless skateboards banned a couple of years ago so it wouldn't do for me to reintroduce that racket with my bike. Any suggestions would be appreciated.