Yamaha YZF-R1 - Protective Gear and Hazard Awareness

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7. High-lift Camshafts
This camshaft has a cam profile etc. changed from the STD one.
To adjust the valve timing, use the oval holes of the standard cam sprocket.
TIP
For valve timing adjustment, refer to the KIT TOOL MANUAL.
NOTICE
x When using this camshaft, use the valve spring set 14B-A2110-72.
x When fitting the camshaft, use the slotted holes of the cam sprockets and always set
the timing to match. If otherwise, no intended performance can be expected and
more over, the engine may be damaged.
Parts List
No. PART No. PART NAMEQ’TY REMARKS
114B-12170-71 SHAFT, CAM 1 1 IN T
2 14B-12180-71 SHAFT, CAM 2 1 EXT
90105-07006
14B-12176-00
2
1
USE THESE OVAL HOLES FOR TIMING ADJUSTMENT.
#1CAM
#1CAM
Cylinder head
alignment surface
Sprocket assembly position at top dead center point of #1 cylinder compression