There's two ways I look at vintage bikes...with my heart, the bikes that I think are just plain cool, and with my head, the bikes that a clear clinical analysis tells me are the ideal race weaponS.
My 'heart' pre '75 250's are.....
*'74 Maico MC250
*'74 CZ250
*'74 Can-Am.
*'73 Yamaha MX250
My 'head' pre '75 250's are....
* '74 OSSA Phantom
* '74 Bultaco Pursang MkVII
* '74 Husky 250 Mag.
* '74 Yamaha YZ250 B
Being a lover of Frankenstein hot rods, I'd love to build the ideal racer using the best legal components available. I'd use a '74.5 LTR Maico frame and forks, the best handling bike in the category. I'd use the amazing Rotax 250 engine from the Can-Am, a Yamaha MX250 front hub, the best brake of the lot, and a Montesa Cappra rear hub, among the lightest and most beautiful legal rear hub. The Rotax engine is pretty good as is but amazing gains can be made with pipe,rotary disc and modern ignition mods. Add the plastic Can-Am tank, aftermarket plastic guards and a pair of Ohlins shocks and I doubt anything would match this baby on the track.