Classic Bike (UK) - - Bsa B50 (and Related Singles) -

The US dirt bike cot­tage in­dus­try swung into ac­tion on the back of the BSA B50 and Triumph TR5MX – and Triumph joined the af­ter­mar­ket per­for­mance gold rush, of­fer­ing a 570cc big bore kit through their dealer net­work; Cy­cle mag­a­zine fit­ted one to their test bike and put it through be­fore­and-af­ter dyno runs.

The re­sults were im­pres­sive. The stock en­gine made 24.23bhp at the rear wheel; with a less re­stric­tive ex­haust and the 570cc con­ver­sion, it leapt to 36.01bhp. Peak torque (at 5000rpm) showed a sim­i­lar hike, with the big-bore mo­tor pump­ing out 34.81lb.ft com­pared to 26.1lb.ft. ‘What a gas: what an ab­so­lute rocket ship,’ raved Cy­cle.

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