October 27, 201213 yr Had a look at a Sherpa 250 that may be for sale. It's definitely an M80 Engine and has the Homerlite Tank/Seat Unit but the present owner believes it has a special Sammy Miller frame. The frame number starts HB 150****** but definitely has tubes under the engine. Is this an early version of a Hi-Boy or was it standard?
October 27, 201213 yr It's a 1974/5 250 with an M80 engine fitted. The frame numbers began 150 for 250 and 151 for 325. It's the model shown on the front cover of the Haynes manual. The HB doesn't stand for Hi-Boy, it's Bultaco's own prefix and used to change from model to model, JB, RB etc. The 150 model's fibreglass tank unit was replaced in the UK with the Homerlite tank, so the tank unit on your bike is correct for that frame. I think all SM frame numbers were prefixed SM and weren't as long as standard Bultaco frame numbers. They all had a bashplate instead of frame tubes.
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