Section 05 FUEL SYSTEM
Sub-Section 04 (CARBURETORS)
05-04-10
2, Low Speed Screw
TYPICAL — SINGLE CARB
1. Low speed screw
TWIN CARBS
1. Low speed screw (PTO)
2. Low speed screw (MAG)
Tighten low speed screw until a slight resistance
is felt. Then, back it off to the specification as per
following chart.
NOTE:
Turning screw clockwise leans mixture
and turning screw counterclockwise enriches
mixture.
Start and warm up engine.
Check that engine idles and runs smoothly. Make
sure engine reacts quickly to throttle lever depres-
sion. If necessary, readjust low speed screw
(± 1/4 turn).
NOTE:
On twin carburetor engines, both low
speed screws must be adjusted exactly the same
way. Never adjust screws more than 1/4 turn at a
time.
14, High Speed Screw
The high speed screw is sealed with a plastic cap
that allows an adjustment of 1/4 turn.
NOTE:
Turning screw 1/4 turn counterclockwise
enriches mixture and turning screw clockwise
leans mixture.
TYPICAL — SINGLE CARB
1. High speed screw
-
CAUTION
Do not attempt to set engine idle speed with
low-speed screw.
Watercraft
model
HX
SP/GS/GSI/
GTS/GTI
SPX/XP/
GSX/GTX
Low speed
screw (turn)
1-1/2 1-3/4 1
F01F0TC
1
F01F33A
21
-
CAUTION
If watercraft is out of water, engine must be
cooled using the flush kit.
-
CAUTION
Do not attempt to adjust high speed screw
by removing plastic cap.
F01F0VA
1
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