Thanks guys, the bike is more of a surviver than a sparkling example. I’ve not known a bike be so abused and neglected as this one. A list of problems once stripped include, broken piston but amazingly the bores were fine with a light hone, worn big end and crank shells, oil pump strainer totally blocked which is why the shells were knackered. Cracked crank cases, chain had jumped off at some stage. Most threads in the head were stripped, after 12 helicoils I gave up and bought another head. Front calliper totally seized, master cylinder also seized, rear hub cracked, rear footrest hanger bent, seat base rusted through, wiring chopped and messed with but, the petrol tank was clean inside! Spacer missing from inside the gearbox which I didn’t find out about till it Went on its first test ride and I had to take the engine back out. Speedo and rev counter both seized. The Alpha exhaust was in excellent condition and cleaned up really well. I must admit if I’d known how bad it really was I would not have restored the bike but I started doing bits and then found myself in too deep to give up. The upside is it’s a great bike to ride and can’t see myself ever selling it.
