A50_A65 | Dutch BSA Owners Club A50 / A65. The type of specialists for these models Klaas Wezel en Jelle Bethlehem. feature. BSA A50 and A65 models are motorcycles with a two-cylinder 500 cc block (A50) or 650 cc (A65), with overhead valves and a unit structure, ie the crankshaft and gearbox are in one house. List of BSA motorcycles - Wikipedia All BSA parallel twins were pushrod operated overhead valve machines. The A7 and A10 models were semi-unit construction until about 1953 and pre-unit construction thereafter. All A50, A65 and A70 models were unit construction.
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