honestthomas

Mk III 250 Ossa. Very slow work in progress.

Woody, Aye I get your drift, I'd just rather have a conversation with one person though, I find I understand things better. The reason I swapped the stanchions over was so the cable ran in a more natural way? so I was trying this until it told me otherwise. Hadn't heard of the reason you mentioned for swapping before? But I agree there's hardly any force driving it backwards so it's not really a fair comparison. If that is the case it might be more the way the shoes have worn biased one way? Do they have a so called 'leading shoe'? I also noticed the drain plug is now above the spindle the other day but it's a two min job swapping back to pump out the oil. As long as that's the only issue? I'm relatively new to bikes, come from an automotive background rather than bikes so still learning the do's and don't's.

Haha Stan I hope you're right. I've done those things whilst waiting for a new carb.

Yeah I'm getting you now. Again Woody thank you very much really appreciate your input and time explaining. I really hoped you'd see the question and pass your eye over the job. Now there's a few other general questions I have, am I ok send you them direct? Can you do that on here? Nothing personal, still about the Ossa's.

Woody. Aye I see what you're saying with the engine/frame numbers there, it makes more sense for it to be a later run out of the 250 than an early pre recorded 350. I'd seen you mention your 700 numbered green bike before in a similar post in the past. Are the frame/engine number sheets found on the Internet from Ossa factory records or from users that have recorded what they've come across do you know? And yes from your other posts actually, about rear shock mounting points on the swing arms I'd concluded it was a MK3 frame, and just because of the photos I'd seen on various sites of all other MK3 frames being a 350 I just presumed mine was one. Only the last week or so I noticed I'd not seen a 350 with the shorter exhaust or the plain fins on the head, without slits, and that some mk2's had a vertical one on one side? I thought it was a 350 but I had a funny feeling and now with more info I agree I thinks it's a 250 also. Really appreciate your help on this, like I said I was hoping you'd see the thread lol. Also yes it doesn't seem to have been ridden in anger at all, the sump guard didn't have a mark on it. The engine and frame too is scuff free, is this unusual ?

Ah Woody, I was hoping you'd see this. Thanks for the input. So it's a 250 then, can you shed some more light on how you know this?

Yeah I think you might be right. Thanks for that pal.

Here's a couple of photos (I hope). If any more detailed pictures are required I can take them.

Hello Robbie, I'll try uploading some tomorrow. Thanks for the reply.

Hello everyone and all. This is my first post and I'm sorry it's turned out to be a question. But I could do with a little help identifying what cc my ossa is. Now I have had a look throughout the forum for a few months now as well as the rest of the web but to no avail, so please forgive me if the info I require is on here somewhere already I've just failed to find it. It was sold as a 250 but after a quick web search I thought it to be a 310. But now after more searching and reading I'm left a little confused. This is what I know: it's a mk3 frame, with the layed down shocks. Both frame and engine have matching numbers starting with 57****, which the charts I've come across on the Internet don't cover. There is also a sticker on the head tube that says "230-TR-76" ,"SEPT-76" ,"570•077". The cylinder head is currently silver but looks as though it may have been black at some point, and doesn't have any splits or sections missing in the fins. Frame is a silvery grey, looks original. And the forks have black bottoms. Oh and the exhaust comes straight up from the port and over the head too. I know these last two points could of been altered additions. Any info or help in direction would be hugely appreciated. Thank you very much. Tommy