Reliability, always questionable with the air-cooled two-strokes, became more of an issue with the extra heat generated by the triple, and there are many recorded reports of warranty claims. At one point the US authorities appear to have stopped a shipment of Berkeleys at the dock pending rectification of what they considered a serious design issue. There seems little doubt that profitability of the Berkeley programme was affected as a result of these claims and the aggressive export drive to markets not familiar with the eccentricities of British sports motoring.