272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf
272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf
272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf
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NOTE: Idle speed may vary according to OEM<br />
specifications.<br />
<br />
ÌÌ<br />
<br />
<br />
<br />
<br />
ÌÌ<br />
Fig. 16<br />
8. Deactivate idle-down device, or remove jumper<br />
wire. Engine should accelerate smoothly to top<br />
governed speed. Re-adjust idle mixture screw<br />
1/8 turn richer if necessary.<br />
9. If the carburetor is equipped with an idle mixture<br />
limiter cap, install it at this time.<br />
a. Position limiter cap (7) so that stop on limiter<br />
cap is at mid point between stops on<br />
carburetor body, Fig. 17.<br />
<br />
<br />
Fig. 18<br />
2. Then turn screw COUNTERCLOCKWISE 3/4<br />
turn.<br />
3. Repeat for #2 cylinder.<br />
This setting will permit engine to start. Final adjustment<br />
will be made with engine running.<br />
Final Adjustment<br />
Carburetor adjustments performed with engine running<br />
must be made with the air cleaner correctly<br />
installed.<br />
Fig. 17<br />
b. Press limiter into position using Knock Out<br />
Pin #19135 (6).<br />
Models 351400, 380400, 351700 and 380700<br />
The <strong>OHV</strong> twin cylinder engine carburetor fuel<br />
mixture adjustment procedure is unique. Perform<br />
adjustments exactly in the sequence shown.<br />
Horizontal crankshaft engines (1) and vertical<br />
crankshaft engines (2) are shown in Fig. 18.<br />
Initial Adjustment<br />
1. Turn idle mixture screw for #1 cylinder CLOCK-<br />
WISE until it just seats. DO NOT FORCE,<br />
Fig. 18.<br />
NOTE: Idle mixture adjustment MUST be performed<br />
with the engine running at 1200<br />
RPM.<br />
Tools Required:<br />
• Tachometer #19200 or #19389<br />
• Tang Bender #19352<br />
1. Start engine and run it for approximately 5<br />
minutes to allow engine to reach operating<br />
temperature.<br />
2. Move equipment control lever to SLOW<br />
position.<br />
3. Hold throttle lever (1) against idle speed screw<br />
(2), Fig. 19. Temporarily adjust idle to 1200<br />
RPM.<br />
14