GENERAL INFORMATION
2.15
If cable slack is excessive, the choke fuel passage will
not open far enough, which may cause cold starting
difficulty. Also, the half-choke position used for
intermittent applications will not function properly.
A
1. Locate the boot by the carburetor and pull it back.
Loosen the friction nut 1 turn or until choke slides
freely. Re-install boot.
2. Push the choke knob (A) in to the full off position.
3. Slide boots off in-line cable adjuster and loosen
adjustment locknut.
4. T urn adjuster until the choke knob pulls out over
1/4².
5. Push on the choke knob lightly while turning the
adjuster the opposite way.
Boot
Adjuster
Sleeve
Lock-
nut
Boot
6. T urn the adjuster until the knob contacts the boot.
7. T ighten adjuster nut.
8. Slide boots back over cable adjuster sleeve until
they touch at the middle point of the adjuster.
9. Pull back the choke knob boot and tighten the
friction nut until the choke will maintain a set
position. Re-install boot.
PILOT SCREW ADJUSTMENT
1. Start engine and warm it up to operating
temperature (about 10 minutes).
Pilot Screw
FRONT
(Engine)
Pilot Screw Adjustment
Refer to Specifications
2. Turn pilot screw in (clockwise) until lightly seated.
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 will be
permanent ly damaged.
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.
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