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Thanks. I'll replace the belt. It seems almost glued on!

Have now acquired the ingredients for the penetrating fluid and some plasticine.

The belt is new.

Excuse my ignorance but what's ATF?

Aha: https://www.engineeringforchange.org/ho ... ating-oil/

It seems cooking oil and acetone should be just as good.

The main bearings on the 125s especially were made of cheese. But these little things were quick. 6 volt electrics, but don't ride after dark.

I am concerned that heat may damage seals. I have ordered a miniature blow torch (the one I have won't give an exact enough flame). I'll need to get the cam belt off first but that's proving difficult. It is on very tightly. I have tried freezing, with no success but could keep going. I'm not going ...

Aaargh. The worn flat Woodruff key won't come out. The seller was well aware of this problem it appears-hence the slipping flywheel. I've drilled it gently and tapped it with a drill (gently!). I've used WD40 on it. It needs heart. So, I've removed all the bits back to the crank and now need to remo...

repeat post

I have a friend who has two 125's of the right vintage. One will be for parts. If you PM me, I'll let him know. I don't see him often, maybe every few weeks.

The MZ 250 of the 70s was a good piece of kit.

This lot might be of use, they might not. http://www.classictyres.com/#

... I agree that my air/paraffin blasting may have missed some nooks and crannies, but I did put the bore scope in and you can see quite a long way round into the gearbox area and it all appeared to be clean... Just a thought - could it be coming from the traces of paraffin left inside after your c...

Bah! Modern yoof. A.J.Stevens of Wolverhampton. You'll be telling me you've never heard of an AJS 7R 350, 500 'Porcupine' TT race bike or 250 2T (Villiers derived) Stormer 'scrambler' next ;) By the time I had one they were part of AMC (Associated Motor Cycles) with Matchless and Norton. Even you y...

go on. what's an AJS?

Ta. Very useful.

There is also the worry as to why this bike was laid up in the first place.

73? I think I was still riding a POS Tiger Cub. Awful thing.

Rob at Revs suggests lapping the end of the crank with valve paste. I'll do that. I will also take the flywheel off, check for pinched wires on the stator and knock out the old Woodruff key. I can then properly position the flywheel. I will also check that all the marks line up-I understand the cam ...

This is weird-there has to be a source of water somewhere. Condensation should have gone by now.