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Back torque-limiting slipper clutch greatly facilitates braking and downshifting from high speed. Close-ratio six-speed transmission delivers seamless power and maximum acceleration. * Despite the increased bore, piston and pin weight has been reduced for more power and smoothness; 1mm smaller main journals reduce friction while 1mm larger connecting rod journals increase performance. * Compact slant-block engine design uses widely triangulated gearbox shafts to make the GP-derived, straight ...