Yamaha TTR250L Service Manual page 167

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ENGINE ASSEMBLY AND ADJUSTMENT
CAUTION:
The bolts (camshaft caps) must be tight-
ened evenly or damage to the cylinder
head, camshaft caps and camshaft will
result.
5.Install:
Cam sprockets
*********************************
Installing steps:
Turn the crankshaft clockwise until the
TDC mark 1 is aligned with the stationary
pointer 2.
Fit the timing chain onto both cam sprock-
ets and install the cam sprockets on the
camshafts.
NOTE:
When installing the cam sprockets, start
with the exhaust camshaft to keep the tim-
ing chain as tense as possible on the
exhaust side, and set the respective match
marks to be parallel with the case surface
on the corresponding sides.
"I" : Intake side
"E" : Exhaust side
CAUTION:
Do not turn the crankshaft during the cam-
shafts installation. Damage or improper
valve timing will result.
While holding the camshafts, temporarily
tighten the bolts.
*********************************
6.Install:
Timing chain tensioner
*********************************
Installation steps:
While pressing the tensioner rod lightly
with fingers, use a thin screwdriver 1 and
wind the tensioner rod up fully clockwise.
4 - 62
ENG

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