The number B50MX/HE15111 denotes a motocross engine. Having looked inside my engine it turns out to have been fitted with a 580cc Big Bore Kit.Thanks to all on the B50.ORG forum for their help in identifying th. Power is sent to the rear wheel through a multi-disc clutch, a four-speed transmission with a right-side shifter, and a drive chain. Service in preparation for the sale is said to have included an oil change, a valve adjustment, and a spark plug replacement. The unit-construction 499cc four-stroke single is equipped with a replacement Mikuni VM carburetor, and a chrome header pipe flowing into a chrome muffler mounted on the right side of the bike. The five-digit odometer shows 160 miles, 50 of which have been ridden by the seller. Controls for the lights, ignition, and decompression lever are mounted to the left side of the handlebar, while the throttle and front brake are mounted on the right. When this situation eased in 1972, Clews began development on 500cc (82mm x 88mm) and 608cc (88mm x 100mm) Strokas, offering them for sale from his new. The chrome handlebar fronts an aftermarket speedometer and headlight installed under previous ownership. Clews, meanwhile, had developed his 490cc Clews Stroka motocrosser around a long-stroke B44 engine of 79mm x 100mm mainly because works B50 engines were still unavailable from BSA. Braking is from a replacement vented 8″ twin leading-shoe drum up front and a conventional 7″ drum at the rear. BSA SEMI-UNIT REAR BRAKE ROD LEVER A7 A10 B50 B44 B33 SCRAMBLER DESERT SLED: Condition: Used. Suspension consists of a telescopic fork with two-way damping as well as dual shocks mounted to the swingarm. Details about BSA SEMI-UNIT REAR BRAKE ROD LEVER A7 A10 B50 B44 B33 SCRAMBLER DESERT SLED See original listing. Added equipment includes a headlight, a taillight, mirrors, and a license-plate holder.Ĭhrome 18″ rims laced to conical hubs wear 3.50″ front and 4.00″ rear IRC tires showing 2000 date codes. It is a combination of a BSA B50 and a BSA B44. Features include chrome fenders, a vinyl solo seat, a chrome grab rail, and a side stand. This custom BSA B54 Cafe Racer is really nice. The oil tank and side covers were refinished under previous ownership. The 2.4-gallon polished-aluminum fuel tank features purple paint, faded side BSA logos, and a Monza-style aluminum fuel cap. This B50MX is now offered at no reserve in Texas for off-road use only with a bill of sale. The bike was acquired by the seller in 2012, reportedly after being modified under previous ownership. The bike is finished in polished aluminum with purple paint accents and features chrome fenders, an aluminum fuel tank, drum brakes, a replacement Mikuni VM carburetor, 18″ chrome rims, a side stand, a mid-mounted single exhaust, and a black vinyl solo seat. This 1971 BSA B50MX is the motocross version of the standard B50 model and is powered by a 499cc OHV single paired with a four-speed transmission.
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