I did some work on this bike for the owner (retired school teacher) a couple of years ago and he had done nothing with it since. He offered it to me for an acceptable price and the deal was done. When home I was able to start it and it ran sort of ok, the wiring was smelling badly and inspection revealed melted connectors. Further investagation showed why, the fuse had been relpaced with a piece of fence wire. Fitting a fuse blew instantly the key was turned on. Eventually found a wire trapped between the frame tube and a mounting. After several rewireing bits and new connectors I had all the electrics working as they should. With the engine running and getting hot the radiator could not hold water and after dropping the oil/water mix it became obvious that a gasket was gone. Engine out and on the bench and the head gasket was well past its use by date. The water pump seal had also been leaking out the drain hole, so what does the PO do, stick a nail in it to stop the leak. The valves were all good so cleaned up ok, head planned flat and while I had it down replaced the rings as they were at maxium gap. The design of the bits and machining is good on these engines, just let down by cheap material quality. The cam runs in ball bearings, the rockers have roller followers and swivel ends to the valves. After waiting weeks for bits to arrive from China I reassembled and fitted to frame. I increased the pilot jet one size as it was a bit hesitant off idle and made some changes to the muffler to try to quieten the noise and it fired up and ran sweet. Nice little engine so far.