The exhaust that comes with the kit is attached in a weird angle, I changed the angle using a couple of 45 degres copper fittings.

Brake System

Since the rims won't allow any brake pads, I had to use the old backpedal brake system.
It's pretty simple, I just screwed an aluminium plate on the old sprocket and attached a cable to it, controled by a brake lever.
When I pull the lever, the plate (the sproket) rotate backwards just like when you pedal backwards.
The spring allows the brake drum to come back in position after applying the brakes.

Chain roller installed

I've installed the chain roller on the frame, since the engine is so low in the frame, the lower part of the chain had to go under the rear arm.
The chain was almost too short but i move the rear wheel forward as much as possible.
Everything is pretty tight but the chain will get loose after a couple of miles.