Handling The Oil; Pump - Yamaha GT1 Service Manual

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YAMAHA AUTOLUB[ -
Handling the Oil Pump · Checking Minimum Pump Stroke
2-3. Handling the Oil Pump
The oil pump is a precision-machined assembly. Make
no attempt to disassemble it.
When you remove the
oil pump from the engine, protect
it
from dust, dirt,
etc., and after reinstalling it, bleed and adjust the pump
correctly. Proper handling will keep the pump free
from trouble.
The oil pump is similar in both construction and opera-
tion to other Autolube systems. The only difference
is the employment of a
5.5¢
plunger because of larger
consumption of oil by a 80 cc single cylinder engine.
2-3-A. Checking Minimum Pump Stroke
1. Checking
a. Fully close the accelerator grip.
b. Turn the oil pump starter plate in the direction
of the arrow marked on the plate. Then
measure the gap between the adjusting pulley
and the adjusting plate. Keep the gap as wide
as possible by observing it with the eye.
Fig. 2-3-1
Fig. 2-3-2
- 9 -
c. Insert a feeler gauge (0.15 mm.) into the gap.
When the gap allows it to enter
..... Stroke is correct.
When the gap does not allow
..... Stroke is insufficient.
2. Adjustment
a. Remove the adjusting plate lock nut, and then
remove the adjusting plate.
Fig. 2-3-3
b. Install a 0.1 mm adjusting shim where the
adjusting plate was.
c.
Fig. 2-3-4
Reinstall the ·adjusting plate lock nut, and
measure minimum stroke. When the gap allows
a 0.30 mm. feeler gauge to enter but does not
allow a 0.35 mm., the stroke is correctly
adjusted.
Stroke adjustment tolerance
mm.
0.30 to 0.35