High-Lift Camshafts - Yamaha YZF-R1 Service Manual

7.

High-lift Camshafts

Parts List
No. PART No.
1 14B-12170-71
2 14B-12180-71
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.
Sprocket assembly position at top dead center point of #1 cylinder compression
#1CAM
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.
PART NAME
SHAFT, CAM 1
SHAFT, CAM 2
90105-07006
USE THESE OVAL HOLES FOR TIMING ADJUSTMENT.
Q'TY
1
1
14B-12176-00
2
#1CAM
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REMARKS
INT
EXT
1
Cylinder head
alignment surface