Calibrating each gauge
(For vacuum balancer gauge)
Start up the engine and run it in idling condition for warming up.
Stop the warmed-up engine.
Remove the fuel tank. (5-7)
Remove the air cleaner box. (5-15)
Install the fuel tank.
Connect the IAT and PAIR control valve sensor couplers.
Connect the IAP sensor coupler and vacuum hose.
Connect the PAIR hose.
Remove the rubber cap (1) from the No.1 throttle body.
Connect one of the four rubber hoses of the vacuum balancer gauge to the nipple on the No.1 throttle body.
- 09913-13121: Vacuum balancer gauge
Start up the engine and keep it running at 1300 rpm by turning throttle stop screw (3).
Caution! Avoid drawing dirt into the throttle body while running the engine without air cleaner box. Dirt drawn into the engine will damage the internal engine parts.
Turn the air screw (4) of the gauge so that the vacuum acting on the tube of that hose will bring the steel ball (5) in the tube to the center line (6).
Note: The vacuum gauge is positioned approx. 30° from the horizontal level.
After making sure that the steel ball stays steady at the center line, disconnect the hose from the No.1 throttle body nipple and connect the next hose of the gauge to this nipple.
Turn air screw to bring the other steel ball (7) to the center line.
The balancer gauge is now ready for use in balancing the throttle valves.
Throttle valve synchronization
To synchronize throttle valves, remove the rubber caps (1) from each vacuum nipples on No.1 and No.2 throttle body.
Connect the vacuum balancer gauge hoses to the vacuum nipples respectively.
- 09913-13121: Vacuum balancer gauge
Connect a tachometer and start up the engine.
Bring the engine rpm to 1300 rpm by the throttle step screw.
Check the vacuum of the two cylinders and balance the two throttle valves with the synchronizing screw (2) on the No.2 throttle body.
Notes:
- During balancing the throttle valves, always set the engine rpm at 1300 rpm, using throttle stop screw.
- After balancing the two valves, set the idle rpm to 1300 rpm.
Caution! Avoid drawing dirt into the throttle body while running the engine without the air cleaner box. Dirt drawn into the engine will damage the internal engine parts.
Note: Make sure that the throttle lever should have a gap (A) (between the throttle lever and throttle lever stopper screw) during synchronization.
- Throttle lever gap (A): 0.17 mm (0.007 in)
