RE: Fixit

87 Yamaha TT 225 discussion forum:


RE: Fixit

RE: Fixit 
Chuck said 2010-01-12 18:11 
 
Valve clearance (cold)
Intake 0.05
–
0.10 mm (0.0020
–
0.0039 in)
Exhaust 0.10
–
0.15 mm (0.0039
–
0.0059 in)

EAS20471
ENGINE ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
NOTE:

Valve clearance adjustment should be made
on a cold engine, at room temperature.

When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
1. Remove: Fuel tank
Refer to “FUEL TANK” on page 6-1.
2. Remove:Intake tappet cover “1”
Exhaust tappet cover “2”
Camshaft sprocket cover “3”
3. Remove:Spark plug cap
Spark plug
4. Remove:Timing mark accessing screw “1”
Crankshaft end cover “2”
5. Measure:Valve clearance
Out of specification
Adjust.
a. Turn the crankshaft counterclockwise.
b. When the piston is in the compression stroke,
align camshaft sprocket mark “a” with cylinder
head mark “b”. This is the Top Dead Center
(TDC).
c. Make sure that generator rotor mark “c”
aligns with generator rotor cover mark “d”.
d. Measure the valve clearance using special
thickness gauge “1”.
Out of specification
→
Adjust.
Valve clearance (cold)
Intake
0.05
–
0.10 mm (0.0020
–
0.0039 in)
Exhaust
0.10
–
0.15 mm (0.0039
–
0.0059 in)
Special thickness gauge
90890-01399
1

Timing Chain:Timing chain tensioner

a. Push down the timing chain tensioner rod
end by your finger, and fully wind up the
tensioner clockwise using a small flat-blade
screwdriver “1” .
NOTE: The timing chain tensioner rod must be held by
the flat-blade screwdriver until the timing chain
tensioner bolt is tightened.

Timing chain tensioner bolt 10 Nm (1.0 m•kg, 7.2 ft•lb)
Timing chain tensioner cap bolt 8 Nm (0.8 m•kg, 5.8 ft•lb)

Send me your e-mail address and I´l send you the manual in PDF format.

Chuck 
 
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