I recon Blue is correct with the engine swap (bastards weres my engine) and the carby is single cable slide, the choke who knows? I have started pulling it down and it was definatly painted while all together and I noticed the handles being a darker shade of green than the model 5's that I have seen some original paint on, was wondering if the early Mod 4 got the same colour as the models 1,2 & 3? what colour is that please Blue?