Checking The Camshaft Sprockets; Checking The Decompression System - Yamaha YP400T, YP400V, YP400W Service Manual

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CAMSHAFTS
5. Measure:
• camshaft journal diameter a
Out of specification → Replace the cam-
shaft.
Within specification → Replace the cylinder
head and the camshaft cap as a set.
Camshaft journal diameter
24.459 ~ 24.472 mm
(0.9630 ~ 0.9635 in)

CHECKING THE CAMSHAFT SPROCKETS

1. Check:
• camshaft sprockets
Wear/damage → Replace the camshaft
sprockets and timing chain as a set.
a 1/4 of a tooth
b Correct
1 Roller
2 Sprocket
CHECKING THE DECOMPRESSION
SYSTEM
1. Check:
• decompression system
M MMM M MMM M M MMM M
a. Check that the decompressor lever pin 1
projects from the camshaft.
b. Check that the decompressor cam 2
moves smoothly.
L LLL L LLL L L LLL L
ENG
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
MMM
LLL