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Ossa identification


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Hello everybody, just bought my first trials bike to refurbish, an Ossa 250 I think with engine no. M231638. I've looked online and all I've found are engine no's. beginning with B. I couldn't find a number on the frame. Any help much appreciated.


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It's a 1975 250 MAR MK2, the engine and frame numbers are the same, just that the engine is prefixed M and the frame B.  The frame number is on the headstock, maybe hidden by layers of paint as the original frame colour is silver/grey with white tank/sidepanels and green stripe. A previous owner has painted it all green and black engine/forks to look like the 1979 version

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