So as goofy as it may sound, I do like to pedal my Raptor around. So I wanted some more gears for the longest and decided to tackle this mission. The cheapo Chinese freewheel is destroyed when taking it off. Just had it open up the side cover and lift the assembly off. Ball bearings all over the place. Screwed on a Maillard 5 speed freewheel, with 14T being the smallest gear. I can only use 4 out of the 5 gears. The derailleur rubs on the motor side cover in 5th gear.
I used a cutting bit, 2x4, Royal Purple motor oil, vice and a router for a poor man's machining job. I got the 255mm rotor installed on the rear.
I have really enjoyed watching your project from the start. You seem to be eliminating most of the problems that everyone runs into doing this sort of build. I really like the way things have turned out so far, and I cannot help wonder what your going to come up with next. Now that you have gotten this far I have to wonder how much you have invested into this bike? In other words what would it cost to put together a kit for a mirror build? I have wanted to build one of these, but the amount of time you have already put into figuring this thing out has been humongous. I could not imagine spending money building this bike and having it take two years or longer from start to finish. I can imagine picking up all of the pieces over a six months or so period and then diving in and building one ready to ride in a month.