90-830234R3 DECEMBER 1997 FUEL SYSTEM - 3B-17
Adjustments
Idle Mixture Screw Adjustment
INITIAL STARTING ADJUSTMENT
Turn idle mixture screw in (clockwise) until it seats
LIGHTLY--then back-off (each carburetor) the cor-
rect number of turns (See Specifications).
LOW SPEED MIXTURE ADJUSTMENT
NOTE: Only the top two carburetors on four cylinder
models have adjustable idle mixture screws.
RUNNING QUALITY ADJUSTMENT
1. Position outboard at level trim. With gear case
submerged, start outboard and allow to warm up.
Throttle outboard back to idle for about one min-
ute.
2. Shift outboard into forward gear. Turn low speed
mixture “in” (clockwise) until outboard starts to
bog down and misfire. Turn mixture screw out 1/4
turn or more.
53422
a
a
54171
3 Cylinder Models
4 Cylinder Models
a - Low Speed Mixture Screw
3. Check for too lean mixture on acceleration.
4. DO NOT adjust leaner than necessary to attain
reasonably smooth idling. When in doubt, stay on
the slightly rich side of the adjustment.
Idle Speed Adjustment
1. Adjust engine idle RPM as outlined in Section 2C
“Timing/Synchronizing/Adjusting.”
Float Adjustment
1. Remove carburetor as outlined in “Carburetor
Removal” in this section.
2. Remove fuel bowl and gasket and check float lev-
el using a carburetor scale (gasket removed).
52372
a
a - 9/16 in. (14.29 mm)
3. Attach Spring Clip on Inlet Needle to metal float
tab and place needle into its seat.
55883
b
a
a - Metal Float Tab
b - Spring Clip
4. If necessary, adjust float level by bending metal
tab (on float) to which inlet needle is clipped.
a
a - Bend Tab Here for Float Level Adjustment
To Next Page
Loading...
Need help?
General
