Carburetor - Inspection and Adjustment

EF & EC-650prose procedure

Idle Speed and Mixture Ratio

Refer to MA section for Inspection and Adjustment of idle speed and mixture ratio.

Place vehicle in a level area and with engine idling, check fuel level through sight glass. If N.G., adjust as follows.

1
Remove choke chamber.
2
Turn choke chamber upside down, raise float, then lower it until float seat contacts with needle valve and in that position check clearance H1. If out of specification, adjust by bending float seat.
H1: 14.5 - 15.5 mm (0.571 - 0.610 in)
SEF073D
3
Raise float until float stopper touches the choke chamber, and check height H2. If out of specification, adjust by bending float stopper.
H2: 44.5 - 45.5 mm (1.752 - 1.791 in)
4
Install choke chamber and recheck fuel level with engine idling.

CAUTION

Always replace choke chamber gasket with a new one.

1
With the engine cold and before starting it, fully open throttle valve and ensure that choke valve closes properly.
2
Push choke valve with a finger, and check for smooth movement.