272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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Fig. 8
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Fig. 10
Final Adjustment
4. Turn idle mixture screw slowly CLOCKWISE (1)
until engine speed just starts to slow (LEAN
mixture), Fig. 11.
All carburetor adjustments performed with the engine
running must be made with the air cleaner
installed.
• Tools Required, Fig. 9:
Tachometer #19200 or #19389
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Tang Bender #19352
1. Start engine. Run for approximately 5 minutes to
allow engine to warm up.
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2. Move control lever on equipment to SLOW
position.
Fig. 11
5. Then turn idle mixture screw COUNTER-
CLOCKWISE (3) until engine speed just starts to
slow (RICH mixture).
19200
19352
Fig. 9
19389
3. Hold throttle lever (2) against idle speed screw
(1), Fig. 10. Temporarily adjust idle to RPM
shown below.
a. 1400 RPM – Governed Idle Spring #805453
(RED).
b. 1100 RPM – Governed Idle Spring #805454
(WHITE).
6. Turn screw to mid point (2) between RICH and
LEAN.
7. Hold throttle lever against idle speed adjustment
screw and re-adjust idle to RPM shown below:
a. 1200 RPM – Governed Idle Spring #805453
(RED).
b. 900 RPM – Governed Idle Spring #805454
(WHITE).
8. Release throttle lever. Note RPM.
9. If necessary bend governed idle tang (5) with
Tang Bender #19352 (4), Fig. 12, to obtain RPM
shown:
a. 1750 RPM – Governed Idle Spring #805453
(RED).
b. 1100 RPM – Governed Idle Spring #805454
(WHITE).
12