Carburettor - Idle speed and Synchronization

IDLE SPEED

1. Adjust the idle speed. Warm up the engine and turn the throttle stop screw (1) to adjust.

Idle Speed:
1,050 ± 50 r/min

CARBURETOR SYNCHRONIZATION

Carburetor Adjustment

Carburetors must be set properly before synchronizing the carburetors.

NOTE:
Valve clearance must be set properly before synchronizing the carburetors.

1.  Remove:

• Seat

• Fuel tank

2.  Disconnect:

• Vacuum plugs (1)

• Vacuum hose (2)

3.  Install:

• Vacuum Gauge (90890-03094)(1)

• Suitable test fuel tank

4.  Start the engine and let it warm up.

5. Turn throttle stop screw (1) to adjust idle speed to 1,050 ± 50r/min.

6. Adjust carburetor synchronization

Carburetor synchronization adjustment steps:

•Synchronize the carburetor No. 1 to the carburetor No. 2 by turning the synchronizing screw "1" until the both gauge readings are the same.

•Rev. the engine for a fraction of a second, two or three times, and check the synchronization again.

Vacuum Pressure at Idle Speed: 24 kPa (180 mm Hg, 7.1 in Hg)

Vacuum Synchronous Difference: 0.7 kPa (5 mm Hg, 0.2 in Hg)

• Repeat the above steps to synchronize the carburetor No. 4 to the carburetor No.3 by turning the synchronizing screw " 3 " until the both gauge readings are the same.

• Repeat the same steps to synchronize No. 3 carburetor to No. 2 carburetor, then turn synchronizing screw " 2 " until both gauge readings are the same.