Have 2 questions....one is how do I mount the engine to the oversized trek frame? My second question is...is aluminum ok to motorize or should I find another frame to work with. Considering the aluminum frame and the oversized tubing has caused me to think about getting another bicycle to convert. Is this a good idea...yes or no. I need some experienced answers on this one. The 4500 was a 600 dollar bike when i bought it and has hardly been ridin. I considered all this today as i went out for a peddler stroll around town. Do I wanna chance busting the frame or do I not have to worry about it? How do i go about mounting the engine on the angled tube of the frame? Exhaust clamps?