Models 351400, 380400, 351700, 380700 - Vanguard OHV V-Twin User Manual

NOTE: Idle speed may vary according to OEM
specifications.
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Fig. 16
8. Deactivate idle-down device, or remove jumper
wire. Engine should accelerate smoothly to top
governed speed. Re-adjust idle mixture screw
1/8 turn richer if necessary.
9. If the carburetor is equipped with an idle mixture
limiter cap, install it at this time.
a. Position limiter cap (7) so that stop on limiter
cap is at mid point between stops on
carburetor body, Fig. 17.
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Fig. 17
b. Press limiter into position using Knock Out
Pin #19135 (6).
Models 351400, 380400, 351700 and 380700
The OHV twin cylinder engine carburetor fuel
mixture adjustment procedure is unique. Perform
adjustments exactly in the sequence shown.
Horizontal crankshaft engines (1) and vertical
crankshaft engines (2) are shown in Fig. 18.
Initial Adjustment
1. Turn idle mixture screw for #1 cylinder CLOCK-
WISE until it just seats. DO NOT FORCE,
Fig. 18.
14
…

Fig. 18
2. Then turn screw COUNTERCLOCKWISE 3/4
turn.
3. Repeat for #2 cylinder.
This setting will permit engine to start. Final adjust-
ment will be made with engine running.
Final Adjustment
Carburetor adjustments performed with engine run-
ning must be made with the air cleaner correctly
installed.
NOTE: Idle mixture adjustment MUST be per-
formed with the engine running at 1200
RPM.
Tools Required:
•
Tachometer #19200 or #19389
•
Tang Bender #19352
1. Start engine and run it for approximately 5
minutes to allow engine to reach operating
temperature.
2. Move equipment control lever to SLOW
position.
3. Hold throttle lever (1) against idle speed screw
(2), Fig. 19. Temporarily adjust idle to 1200
RPM.
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