Re: Friction drives , a review of a few
I've owned both the Dax units and the BMP (now Roadbug, same kit). They both performed well. The trick to rid excess clutch bell noises is with engine mounting. You can loosen the bolts and twist the engine slightly to fine tune its positioning. Also, the included engine to channel spacers may not be the optimum length for every engine & getting the engines clutch positioned the correct distance from the bell is important. Of the two I've owned I'd have to say the BMP/Roadbug is a better quality build, but the Dax offers a larger roller (1.5") for more top speed applications provided the engine you choose can pull the taller gear ratio.
FYI, friction drives don't do well in the rain (or any wet spots on the road)...