Color code : NH146B
Color code : NH146B
Color code : NH146K
Honda CBR
Displacement: 600 cc
Year: 2003
Model code CBR600F43 Color: NH146B / NH146K
Additional engine changes include a lighter camshaft sprocket and increased valve spring pressure (two springs per intake valve) which allow for higher revving. There are new piston rings that slide with less friction and increased internal engine oil flow. Redline is now 14,200 rpm,[10] 700 rpm higher than the previous year\'s F4.[12] To increase the bike\'s pulling capabilities at high speeds, the fifth and sixth gears have been shortened slightly and the rear sprocket was enlarged from 45 teeth to 46, also adding one clutch plate for greater durability to now making 8.[12] The oiling holes in the camshafts have been enlarged by 0.5 mm (0.02 in) (to 2.5 mm (0.10 in)) and piston ring friction has been decreased to aid cooling at the higher rev ceiling.[12] Spring pressures on the intake and exhaust valves have been increased to avoid valve float. Also, there are now two valve springs (inner and outer) on the intake side instead of the single item that resides on the exhaust side
