I sorted out the spark plugs, it’s running on all four but I can’t seem to to get the timing and carb set up properly. If the timing is advanced, it idles at too high a speed and the idle adjustment screw is “out of play,” if I retard the timing and then increase the idle speed, it will bog down and eventually stall and be difficult to re-start. Also it runs too hot (new tube in the head) and has overheated twice while on the road. Possibly a vacuum leak, but I sure don’t know where. The compression is still good, so overheating hasn’t warped the head as far as I can tell. Any advice would sure be appreciated.