identifying cotton frames by philip butcher - written 09/02/2014 19:11:04

hello i have aquired a 1920/30s cotton frame with no visable  frame numbers to which i hope to fit a 500cc twin port jap engine, the frame and forks dont look as if they are large enough to take the engine /gearbox.               my question to the knowledgable owners is how many basic sizes of frames were avaliable and how to identify them ? i have a feeling that i have got a frame for a 250cc motor ? thanks in advance   philip



 



 



 


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