 Instead of producing a production 750, the 650SL was born with 82 mm bore and the required 61.5 mm stroke.bodywork is virtually identical to the 600 but was painted red and yellow, had a different instrument layout and some other minor changes, but it had more torque, and that was a big improvement and was considered by many as THE pantah.The 650SL produced 63 hp at 8,500 rpm.