trials09 Posted February 19, 2012 Report Share Posted February 19, 2012 Hi All I am currently looking at an Ossa to buy, it's in pieces. Firstly I can not find a frame number. I'm told the frame is a 1972 Model. Please what is the location? I have two area's of concern. Is the skid plate available anywhere? On the off chance the magneto is no good. What are my opions and how much. Cheers Quote Link to comment Share on other sites More sharing options...
feetupfun Posted February 19, 2012 Report Share Posted February 19, 2012 Hi All I am currently looking at an Ossa to buy, it's in pieces. Firstly I can not find a frame number. I'm told the frame is a 1972 Model. Please what is the location? I have two area's of concern. Is the skid plate available anywhere? On the off chance the magneto is no good. What are my opions and how much. Cheers There was an OSSA MAR bashplate that just finished an auction on eBay in Australia - no-one bid on it Yes there are modern replacement ignitions available ex the UK for a few hundred dollars There should be an engine number stamped into the aluminium on the top side of one of the front motor mount lugs I dont remember where the frame number is but can have a look at mine after work tomorrow if no-one else can help Quote Link to comment Share on other sites More sharing options...
woody Posted February 19, 2012 Report Share Posted February 19, 2012 (edited) If it is a 1972 model it is a MK1 MAR and I don't think they began to stamp the frames with the frame number until 1973/4. Instead they had a sticker on the headstock which very rarely is still in place these days (or at least the UK bikes seemed to be like this) I have a MK1 and there is no number on the frame, it had the sticker. I have another MK1 frame with no number and I recently sold another which had no number. The engine and frame numbers matched when new (the engines are prefixed M and the chassis B ) There is no way of knowing whether it has the original engine of course but the engine can be dated from the number by using the chassis number reference charts that are available http://ossa.2y.net/ossa/reference/ossa-frame-nr.html The MK1 had a fibreglass bashplate and these used to be availble from Ossa specialists in the USA if you wanted to use a fibreglass one. Personally I'd look for a used alloy one, they come up on ebay UK reasonably often if you can't find the unsold one mentioned above. http://www.rpmsfiberglass.com/ If you find your ignition is no good and don't want to buy a new one, Bradford Ignitions (aka Motoplat UK - but now based in Spain) can repair Motoplat stators http://www.uk-motoplat.com/ Edited February 19, 2012 by Woody Quote Link to comment Share on other sites More sharing options...
trials09 Posted February 20, 2012 Author Report Share Posted February 20, 2012 Hi All Thanks very much for the info fellas. I am told the engine is a '74'. A few things missing, shocks, guards, bashplate and tyres are no good. The frame is painted. He wants $350 for it. Should the tank have the fork clearance if that makes sense? Cheers Quote Link to comment Share on other sites More sharing options...
woody Posted February 20, 2012 Report Share Posted February 20, 2012 Most, maybe all of the original tanks had cut-outs for the fork legs, so that is normal. As I mentioned before there is no guarantee that your engine is the orginal one for the frame, obviously that doesn't matter in the slightest, it just doesn't specifically date your bike as 1974. However, all the frames from 1971/2 original MAR up to the last 1979 green MAR had the same frame. You can tell the model (as long as the bike hasn't been modified...) from the position of the top shock mount (although later models will have the number stamped on) If it sits right in the angle of where the rear frame loop meets the frame upright it is a MK1 or MK2 frame (they're the same) On the MK3 the shocks were angled so if the top mount is level with the bottom mounting lug for the sidepanel, it is a MK3. On the green models the top mount was moved back up slightly so if it sits between the two sidepanel mounts it is from a green bike (called TR77 with the black frame and TR77 Verde with the green frame which was the last of the MAR models) Swingarms came in 2 lengths and had the lower shock mount in different positions depending on the model but again there is no guarantee it has the original swingarm. The MK1 model had a short swingarm and you can tell that type by the shock mount. If it sits right in front of the rear wheel spindle it is a MK1. These date from 1971 - late 1973. The MK2 had a longer swing arm (1 1/4") On these the shock mount sits about 1" or so in front of the rear wheel spindle. These date from 1974/5 but there is some cross over in parts between late MK1 and early MK2 models so you could have bits of both on either (there were some engine differences too) The MK3 and green framed bikes had the same length swingarm as the MK2 (I think) but the shock mounts were moved back over the spindle to account for the lowered top mounts on the frame. There may be another variation on the swingarm but can't remember off the top of my head. So, if your frame matches the description of the MK1 / MK2 frame but has no frame number, it is almost certainly a MK1, as I'm pretty sure that from the MK2 the frames were stamped. Another site with some useful pictures is here http://www.ataq.qc.ca/galerie/index.php?folder=/Mus%E9e/Ossa/ Quote Link to comment Share on other sites More sharing options...
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