I have a walmart beach cruiser that I purchased this summer. I wanted to put my r/s friction roller motor on it. I saw a picture of the same bike with one supposively. My question is how do I mount the engaging rods if i don't have eyelets on my rear drop outs? My second question is should I use 100 percent synthetic 10w-30. i am afraid of moisture build up with cold nights after work. 10w-30 or 10w-40?