3. MAINTENANCE OPERA TIO NS
5. Snap the throttle several times and recheck
vacuum pressures after the four car-
buretors are indicating the same vacuu m
pressure.
Repeat the adjustment in item
4 if vacu-
um pressures lack uniformity.
Check the following items if vacuum
pressure is less than
15 cm Hg for any
of the carburetor :
1. Be sure the ignition timing is
- 5°/1,150- 30° 2,500 rpm BTOC.
2. Check the tappet clearances.
Inlet:
0. 05mm (0. 002 in.
Exhaust·
O. 08mm O. 003 in.
3. Check the spark plug gap.
Gap:
0. 6-0. 7 mm 0. 024-0. 028 in. )
4. Check the compression pressure.
Pressure
11- 12 kg /cm
2
156. 45-170. 67 psi.
6. Adjust the throttle stop scre, .. to an engine
idle speed of
950- 1, 050 rpm after all
four carburetors have been adjusted to
the same vacuum pressure.
7. Adjust the air screw on each carburetor.
(the standard adjustment for the air
screws is 1 3 8 turn open from the
complete close position)
8. Readjust the engine idle speed to
950
- 1, 050
rpm with the throttle stop screw.
Note:
Tighten the plug s in the inlet manifold
after 1>erform ing the car bur etor
S) nchro-
nizati on.
Throttle Cable Adjustment
1. T urn the adjuster counterclockwise at
the handle bar end to increase play in
the throttle cable.
Note:
Leave about 3 mm 0. 12 in ran ge of adjust-
ment at the cab le adjuster for final micro -
adjustment.
2. Loosen the cable lock nut and turn the
adjuster at the carb uretor end to provide
3,....,4 mm
1
~-' 3z
in .) play at the throttle
grip Aange
Note:
The throttle lever should hit the eccent ric
pin when the gri p is forced to the full
closed posit ion. Repla ce the return cable
with new one if it docs not hit.
(2)
Fig . 8 t Low vacuum
2 Normal
3
3 ) High vacuum
Fig . 9 1) Adjusier @ Lock nut
/
Fig . 10 © Adjuster
21 Lock nul
G)
@ Decrease
(4 IncreaSl'
9
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