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Vanguard Single Cylinder Manual

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1
3. With the engine running, apply 12VDC to
white connector with the blue
wires([C]Fig. 44). Extended governor will
be pulled against head of idle down bolt.
([C]Fig. 44).
Fig. 44
4. Adjust nut ([A] Fig. 44) to obtain 2100-2500
RPM.
Use the lowest RPM in this range that the
electro-magnet will hold reliably. Remove 12VDC
from connector.
5. Hold nut and idle down control in this
position and tighten nut ([B] Fig. 44) to
listed value.
SEE SECTION 14- ENGINE SPECIFICATIONS.
6. Re-apply 12VDC to connector to check
electro-magnetic action and engine RPM.
Re-adjust, if necessary.
Spark Plug Maintenance
Replace Spark Plug
Replace spark plug every year. Replace spark
plugs if electrodes are burned away, or the
porcelain is cracked.
NOTE: Local laws may require the use of a
resistor spark plug to suppress ignition signals. If
an engine was originally equipped with a resistor
spark plug, replace it with the same type of spark
plug.
Do not blast-clean spark plugs. Spark plugs
should be cleaned by scraping or hand wire
brushing and washing in a commercial solvent.
Use a wire gauge ([A] Fig. 45) to set the spark
plug gap.
Set spark plug gap at listed value.
Fig. 45
Torque spark plugs to listed value.
SEE SECTION 14- ENGINE SPECIFICATIONS.
Valve Clearance Adjustments
Adjust Valve Clearance
Valve clearances should always be adjusted on
a cold engine.
1. Remove the valve cover.
2. Rotate the crankshaft in the normal
direction until you get to TDC (Top Dead
Center) of the compression stroke.
3. Insert a narrow indicator (screwdriver or
small rod) into the spark plug hole against
the piston to indicate piston movement.
4. While watching the indicator, rotate
crankshaft clockwise (CW) past TDC until
piston is 0.25 in. (6mm) down from TDC.
This is to prevent the compression
release (if equipped) from affecting
adjustments.
5. Loosen the jamb nut on the rocker arm.
For correct clearance dimensions see page 255.
6. Insert the proper feeler gauge. While
moving it back and forth, carefully tighten
the adjustment screw until a slight amount
of resistance is felt on the feeler gauge.
… 27 …


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