Hello again everyone,
A good while back I asked some questions regarding my 250 MAR . I got some great info but as expected I’m going to need more help!
Ive only just got round to working on it now . I was too busy but like most people I’ve suddenly got a lot more time on my hands these days !
So far I’ve cleaned and painted what I can, I’m not sure the silver and green I’ve managed to get is quite right both are a bit too bright . I’m not too fussed on that, I just want a working bike that I can ride. I’ve got a rolling chassis , i need some parts ( see below ) but in general the build is fine apart from the engine.
I’m up for learning, and I’ve got some manuals but I think this engine has had a rough life and some unsympathetic previous owners. Because of that I think this job is going to be a bit trickier.
One thing that I’ve noticed is that there seems something amiss with the clutch. As you all know, the clutch cable attaches onto a lever which turns a vertical shaft and it in turn acts on a horizontal shaft that runs through the sprocket . This little rod or shaft just shoots in and out with zero resistance. It goes in so far that you can’t see it, but if you turn the engine on it’s side it falls right out again. So as far as I can see there’s no way that can transfer any pressure through to the other side of the engine.any ideas? I’m assuming that there’s something not right internally and so the engine will require to be split to investigate. I will try to attach pictures of the shaft I’m referring to
I was up for having a go at the more standard stuff and change gaskets, seals, clutch plates etc but if there’s likely to be damage that requires experience to resolve it might be time to leave the engine into a professional .
when I got the bike it was in bits already , on removing the head I noticed the piston rings are missing. I know the bike had been in bits for decades and the head was only on loosely . The piston and bore look in good shape. Piston is stamped with a 72 and a 4 . I’m not sure what that means in terms of piston size as my manual refers to the sizes in letters . Would you think it’s possible to order rings to fit this piston? Or is it a no brainer to just fit a new piston ?
The engine number is M342 454. Which makes it a MK1 with a smaller crank apparently ? It was mentioned when I looked and engine rebuild kits
Aside those queries my plan is to order up
a gasket kit
crankshaft seals
brake shoes
brake and clutch levers ( They are missing)
chain and sprockets
shocks or springs.. I have working shocks but the springs are cosmetically damaged. If I can just change the springs I will
Ive found all of the above online, just thought I would ask here before ordering incase there’s something else I should do ! Or otherwise !
Thanks in advance! Scott