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(Non Emissions Models Without Limiter Caps)
1.Before adjusting the carburetor, clean or replace the air filter and spark arrester screen.
2.Fill pump housing with clean water.
3.Start engine and run for several minutes to reach operating tem- perature.
Idle Speed Adjustment
Turn "idle" speed adjustment screw (C) CW (clockwise) until engine speed reaches 3000 RPM. Turn screw out, CCW an additional 1/4 turn.
Basic Setting
1.Stop engine and turn both LO (B) and HI (A) needles in, CW until they stop and are lightly seated.
Important
DO NOT over tighten needles. Forcing them to tighten will dam- age the carburetor.
2.Turn LO (B) needle out, CCW
Fine Tuning
(Requires Accurate Tachometer)
1.Start engine and allow to warm to operating temperature (minimum 2 - 3 minutes) varying engine speed from idle to full throttle.
2.Always begin fine tuning with LO (B) needle.
a.Lean
b.Rich
c.Final setting - Set needle at mid point between lean rich drop- off points. (3)
d.Turn needle 1/8 turn CCW (out) making mixture slightly richer. (4)
3.HI speed adjustment.
Adjust HI (A) needle with tachometer. Refer to Wide Open Throttle
RPM settings listed on "Specifications" page.
4.Check idle speed and reset if necessary. If tachometer is available,
idle speed should be set to the specifications found on "Specifica- tions" page of this manual.
C
A
B