Stroker Shaft Yamaha 62t/61x [u1070] Available in +4, +5, +8, +10. Special order only item we do not stock them (except inside our motors :-))... Stock rod : 68mm Standard stroker sizes are 73mm, 74mm, 76mm, 78mm High Horse Power crankshaft Using superior material for exacting standards Better press fit Precision heat treated Lighter than stock for improved acceleration improved balance tolerances Precision roller bearings -