Honda P50 motor in wheel moped

When I first bought this bike. The throttle twist grip would hardly rotate. The cable was present and attached at the throttle end, although not attached to the carburettor. Investigation showed that the cable outer had become crushed and damaged, resulting a rusty amalgamation, and there was no way the cable could be rescued. New cables are very expensive. I therefore decided That eventually I will have to manufacture a replacement  Luckily throttle cable universal kits are around half the price of a new cable. It was not immediately obvious how to dismantle the twist grip.  The grip itself consists of a rubber sleeve that slips over an inner tube. The tube has a spiral groove on the inside that engages with a slider in the handlebar and to which the cable is attached. Twisting the sleeve therefore pulls the cable to and fro in a groove in the handlebars. The sleeve itself has to be loose in order to rotate. There is a small grub screw that passes through a slot i...

First step was removing the brake shoes. Usually not difficult but this time very difficult. The shoes pivot on a stud at one side and the other side is held under tension by a sping. The spring was missing in my case and the pivot pin badly rusted. You can see the split pin and washer here but the split pin would not come out! These brake shoes lacked the spring but luckily I had one present on the other motor. Eventually I broke the split pin and filed it flush so that I could remove the washer. ... and eventually the shoes... they needed tappingcapart with screwdrivers of increasing thickness until the shoe could be eased off the pivot stud. First shoe off Followed by the second. The remains of the split pin within the pivot stud would still not move and eventually had to be drilled out, bu I left that task until I had separated the cases to improve access. The next step is to remove the brake actuating lever but before doing so I used a punch to mark against the position of the spl...