52
4. Cable adjustment is made at the cable
adjusting screw located above the left
carburetor housing, directly in front of the
generator. Loosen cable adjusting screw
lock nut and turn adjusting screw in for
additional stop clearance and out for less
until l/g inch of stop clearance is observed
with the throttle at maximum open
position.
NOTE:
1. Do not adjust to less than c inch
clearance.
2. When throttle is closed after adjustment,
the oil pump control arm may not return
to its closed position and may appear to be
faulty. However, the oil pressure in the
pump sometimes holds the control arm
open when it is operated without the engine running. This can be checked by running the engine or
operating the kick starter.
C. Special Attention — Pump Modification
Bridgestone 175 Dual-Twins manufactured after October, 1965, are equipped with a modified oil injection
pump. The new pump is equipped with ball and spring check valves in each of the pump body oil outlets.
The springs fit inside the union bolts which are unchanged from previous models.
DISMANTLING OIL PUMP
1. Ball check valves are installed only in the outlet ports (Never
in the inlet port.)
2. Ball check valves cannot be installed in the old style pumps
that were not originally equipped with them.
3. When assembling the unit, first install the ball in the outlet
port hole. Next, install the spring into the union bolt. Then
with the oil line connector and picking washers installed on
the bolt, screw the bolt into the outlet port hole.
4. The style of oil pump can be determined by viewing into the outlet port holes. The outlets on the old style
pumps have no ball valve seats machined in them and the check
ball will pass through the outlet, into the oil pump body.
• The new style pumps have check ball valve seats machined in the
outlet ports.
5. New style oil pump assemblies are interchangeable with the old
style assembly. An additional change was made in Feb., 1966,
Serial No. 16B. This change incorporates the ball and spring check
valves into a new style outlet connector.
The ball and spring are assembled inside of the new connector and
eliminate the possibility of incorrect assembly or loss of these parts.
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