Carburetor Synchronization - Yamaha RS90K Manuel D'atelier

CARBURETOR SYNCHRONIZATION

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CARBURETOR SYNCHRONIZATION
NOTE:
Prior to synchronizing the carburetors, the valve
clearance and the engine idle speed should be
properly adjusted.
1. Remove:
• Vacuum cap 1
2. Disconnect:
• Vacuum hoses 2
3. Install:
• T-joint
• Vacuum gauge 1
• Engine tachometer (near the spark plug)
Vacuum gauge:
90890-03094, YU-44456
Engine tachometer:
90793-80009, YU-08036-C
NOTE:
Connect the vacuum hose and vacuum gauge hose
to the T-joint.
4. Start the engine and let it warm up for several
minutes.
5. Inspect:
• Engine idle speed
Out of specification
Refer to "ENGINE IDLE SPEED ADJUST-
MENT".
Engine idle speed:
1,300 ~ 1,500 r/min
6. Adjust:
• Carburetor synchronization
INSP
ADJ
→
Adjust.