970cc big bore kit to fit to CB750 1969 - 1978, 70mm pistons, H beam rods 16 mm little end bush, 4340. Steel, Shot peened, sleeves, conrod bearings, and head gasket. Machining available, I can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball, and clean and balance, or if I can do the whole engine. Machining involved to barrel and top case. Also offer crank upgrade see pictures in store, 4kg lighter, polished, knife-edged, modern design, oil gallery's cleaned and re balled and balanced.