Classic Bike (UK) - - Contents - Gary Pinchin, ed­i­tor clas­sic.bike@bauer­me­dia.co.uk

BSA’S unit-con­struc­tion sin­gle-cylin­der en­gine might not have had the iconic al­lure of the pre-unit Gold Star, but it proved com­pet­i­tive in its day, pre­dom­i­nantly as a light­weight mo­tocrosser but also in road rac­ing (es­pe­cially en­durance rac­ing) and, of course, formed the ba­sis of sev­eral peppy road­ster mod­els. The thumper grew in ca­pac­ity from 350 to 440cc, and fi­nally to the 500cc B50. When BSA closed, the re­main­ing B50s were re­badged as Tri­umphs, but good as any of the Bsa/triumph pro­duc­tion bikes might have been, they had so much more to give. This was proved when we tested a pro­to­type BSA had been de­vel­op­ing us­ing the Iso­las­tic sys­tem Nor­ton used so ef­fec­tively on the Com­mando range. One of the many things we dis­cov­ered this month was that de­spite Yamaha’s su­per­moto-styled TDR250 be­ing ini­tially con­sid­ered to­tally im­prac­ti­cal, it’s ev­ery bit as much fun to ride as it’s TZR racer-style sib­ling. But de­bunk­ing old prej­u­dices is part of the joy of re­vis­it­ing old clas­sics.

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