MAINTENANCE
2.15
PILOT SCREW
Thepilotsystemsuppliesfuelduring engineoperation
with the throttle valve closed or slightly opened. The
fuel/air mixture is metered by pilot screw and
dischargedintothemain bore throughthe pilot outlet.
CAUTION:
The pilotscrewiscalibr at edat thefactory to meetEPA / CARB
regul at ions for air qualit y standards and is sealed with a brass
plug t o pr event tamper i ng. Removal of the tamper proof plug
is not permi t ted. For ser vi ce purposes, cl eani ng of the pilot
cir cui tcan be done only by a cert i f ied repairshop to ensure air
quali t y standards are not exceeded.
Pilot Screw location
Brass Plug Installed
Brass Plug Removed
PILOT SCREW ADJUSTMENT
Pilot Screw
FRONT
(Engine)
Pilot Screw
View -- Right Cover Panel Removed
1. Start engine and warm it up to operating
temperature (about 10 minutes).
2. Turn pilot screw in (clockwise) untillightlyseated.
T urn screw out the specified number of turns.
NOTE: Do not tighten the pilot screw forcefully
against the seat or the screw and/ or seat willbe
permanent ly damaged.
Pilot Screw Adjustment:
Trailboss 330 -- 2 Turns Out
The pilot screw is set at the factory.
Each carburetor will have a slightly dif -
ferent pilot screw setting, the adjust-
ments below are the recommended set-
tings, the settings may differ from these
recommendations.
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.
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