Yamaha XS750, Manual, Page: 18 / 154

5.
Reinstall the chain tensioner cap and the con-
tact breaker cover.
G.
Valve Clearance Adjustment
NOTE:
Valve clearance must be measured with
the engine a t room temperature.
1.
Remove gas tank.
2. Remove air scoop on cylinder head
3. Remove cylinder head cover and breaker point
cover. Care should be taken to not scratch or
damage gasket sealing surfaces.
4.
Turn crankshaft with nut on l ef t end ofcrank-
shaft to turn cams. The proper position of the
cam when measuring
valve clearance is with
the cam lobe directly opposite the valve lifter.
5.
Insert a feeler gauge between the valve lifter
and the cam heel.
Exhaust valve clearance (cold)
Intake valve clearance (cold)
0.21 - 0.25mm (.008 -.010")
0.16 - 0.20mm (.006 - ,008")
Adjustment
Valve clearance
is
adjusted by replacing the adjusting
pad on the top of the valve lifter. Adjusting pads are
available in
25
thicknesses ranging from No. 200
(2.00mm) to No. 320(3.20mm) in steps of 0.05mm.
The thickness of each pad is marked on the pad face
that contacts the valve lifter (notthe cam). Adjustment
of valve clearance is accomplished
as follows:
1. Determine valve clearance (feeler gauge
measurement.
2.
Remove adjusting pad and note number.
3. Select proper pad from appropriate chart
(intake or exhaust chart).
Install new pad and check installed clearance.
4.
Procedure
1.
Measure valve clearance. I f clearance is in-
correct, record the measured amount of
clearance. This must be measured carefully.
2.
There is a slot in the valve lifter. This slot must
be positioned opposite the blade of the tappet
adjusting tool before the tool
is installed.
3.
Turn the cam until the lobe fully depresses
the valve lifter and opens the valve. Install the
tappet adjusting tool as shown to hold the
lifter in this depressed position.
ADJUST
I
NG
TOOL,
CYLINDER
PAD REMOVAL
SLOT