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Camshafts, Sprockets
Camshafts, Sprockets:
Camshaft Duration Lift
49118-0008 (STD) (Intake) 300° 9.1 mm
49118-0045 (STD) (Exhaust) 292° 8.5 mm
49118-0034 (Kit) (Intake) 310° 9.7 mm
49118-0077 (Kit) (Exhaust) 280° 8.0 mm
Use the kit valve springs (49078-0049) when the kit exhaust camshaft (49118-0077) is
used.
Install the kit valve springs facing the rough coiled side (pink paint end) to the retainer.
Adjust the valve clearance within the specified value. Intake: 0.15 ~ 0.24 mm, Exhaust:
0.17 ~ 0.22 mm
More performance is expected when adjusted from middle value to upper limit between
adjustable range.
If you can not adjust the valve timing for racing, install the camshaft sprocket to the
camshaft using the round bolt holes and adjust the cam chain timing according to the
Ninja ZX-10R Service Manual. If you adjust the valve timing, install the sprocket to the
camshaft between the adjustable range of the long bolt holes.
Tighten the camshaft sprocket bolts to 15 N·m (1.5 kgf·m, 11 ft·lb) of torque.
Valve Timing
Timing (cam lift center) Intake Exhaust
When the round bolt holes are used
(Original)
104°
(Original camshaft)
102°
(Original or Kit camshaft)
When the long bolt holes are used
108°
(Kit camshaft)
102°
(Original or Kit camshaft)
When grinding the cylinder head bottom surface, grinding the cylinder top surface or
using thinner gaskets, be sure the valve to piston clearance especially.
When using the sprocket long bolt holes and adjusting the valve timing to be different
from the standard timing, check the valve to piston clearance of all cylinders after
adjusting the valve clearance correctly.
Valve to Piston Clearance (Min.)
Intake 0.7 mm
Exhaust 1.2 mm
If the valve to piston clearance is less than the minimum value, do not start the engine
because the valves will touch the piston and the engine may be damaged.
Adjust the valve timing again to keep the valve to piston clearance more than the
minimum value.
Method of measuring clearance of valve and piston –1.
Holding the crankshaft at 10° ATDC (intake) and 10° BTDC (exhaust) of crankshaft
timing, measure the amount of the tappet movement until the valve comes in contact
with the piston pushing the tappet.
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