Around here in the late 50s early 60s a good number of young lads who could not afford a real Gold Star bought BB34A Clippers for scrambling. These machines could be made to go quite well if one did not worry about the small bearing bottom end. After all a Clipper had the same head as was used on a BB34GS scrambler just a few years earlier so it was really up to the piston, cams and carb to define the output.
Brother Wilfred had such a machine and after using it as it came (used) he worked with one of the BSA dealers to upgrade it. In went a 10.5:1 piston and what the dealer said were "Road Race" cams. As well at times a TT carb was used to try and squeak a bit more hp than the Monobloc
. It became a decent machine which would have had the same performance as the BB34GS. It was particularly good in muddy conditions.
Here is a shot of Wilfred competing at the BC Provincial Championship races around 1960 in Vancouver BC before he upgraded the engine. Yes it was a muddy track.
Click to enlarge