272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

CARBURETOR ADJUSTMENTS
Models 290000 – 350000
The Vanguard OHV twin cylinder engine carburetor
fuel mixture adjustment procedure is unique. Perform
adjustments exactly in the sequence shown.
NOTE: If engine is equipped with Performance
Control electronic governor see separate
adjustment procedure.
Fig. 5
ARMATURE AIR GAP ADJUSTMENT
1. Loosen screws holding armature in place. Slide
armature away from flywheel and tighten one of
the screws.
2. Rotate flywheel until magnet is under armature
laminations.
Initial Adjustment
1. Turn idle mixture screw (1), Fig. 7, CLOCKWISE
until it just seats. DO NOT FORCE.
2. Turn valve COUNTERCLOCKWISE 1-1/4
turns.
This setting will permit engine to start. Final adjustment
will be made with engine running.
NOTE: Parts removed for clarity.
3. Place thickness gauge (1) between magnet and
armature laminations, Fig. 6.
• All EXCEPT Models 540000, 610000 – Use
0.008” – 0.012” (0.20 – 0.30 mm) gauge.
• Models 540000, 610000 – Use 0.005 – 0.007”
(0.13 – 0.18 mm) gauge.
ÌÌ
ÌÌ
ÌÌ
ÌÌ
Fig. 7
Fig. 6
4. Loosen screw on the armature. Allow armature
to be pulled against the gauge by the flywheel
magnet. Tighten both armature screws to 25 in.
lbs. (3 Nm).
5. Rotate flywheel to remove gauge.
6. Repeat procedure for the other armature.
If engine is equipped with a secondary governor
spring, Fig. 8, check governor lever adjustment
procedure before starting engine.
(1) Primary Governor Spring
(2) Loop (faces UP)
(3) Secondary Governor Spring
(4) Loop Over Tab
(5) #2 Hole (Generators)
(6) #1 Hole (Remote Control)
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