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2.
Turn pilot screw in (clockwise) until lightly seated. Turn
screw out the specified number of turns.
NOTE: Do not tighten the pilot screw forcefully
against the seat or the screw and/or seat will be
permanently damaged.
The pilot screw is set at the factory.
Each carburetor will have a slightly
different pilot screw setting, the
adjustments below are the recommended
settings, the settings may differ from
these recommendations.
Pilot Screw Adjustment: 2.5 Turns Out
3.
Connect an accurate tachometer that will read in increments
of + or - 50 RPM such as the PET 2100DX (PN
8712100DX) or the PET 2500 (PN 8712500).
4.
Set idle speed to 1200 RPM. Always check throttle cable
freeplay after adjusting idle speed and adjust if necessary.
5.
Slowly turn mixture screw clockwise using the pilot screw
wrench until engine begins to miss.
6.
Slowly turn mixture screw counterclockwise until
idlespeed increases to maximum RPM. Continue turning
counterclockwise until idle RPM begins to drop.
7.
Center the pilot screw between the points in step 5 and 6.
8.
Re adjust idle speed if not within specification.
Idle Speed Adjustment (Carb Models)
1.
Start engine and warm it up thoroughly.
2.
Adjust idle speed by turning the idle adjustment screw in
(clockwise) to increase or out (counterclockwise) to
decrease RPM.
Idle Screw
Idle Speed:
1200 + 200 RPM
NOTE: Adjusting the idle speed affects throttle
cable freeplay. Always check throttle cable freeplay
after adjusting idle speed and adjust if necessary.
Carburetor Draining (Carb Models)
The carburetor float bowl should be drained periodically to
remove moisture or sediment from the bowl, or before extended
periods of storage.
NOTE: The bowl drain screw is located on the
bottom left side of the float bowl.
1.
Locate the float bowl drain screw and line.
2.
Place a clean container beneath the bowl drain spigot or
bowl drain hose.
3.
Turn drain screw out two turns and allow fuel in the float
bowl and fuel line to drain completely.
4.
Inspect the drained fuel for water or sediment.
5.
Tighten drain screw.
6.
Start machine and check for leaks.
NOTE: All tubes attached to the carburetor must be
check for pinching or blockage, as this will effect
engine performance.
Drain tube
attached here
Drain Screw
MAINTENANCE
Drain Screw
2.17
2
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