3
A
CARBURETOR/FUEL PUMP
90-826883R2 JUNE 1998
Page 3A-1
FUEL SYSTEM
Section 3A - Carburetor/Fuel Pump
Table of Contents
Specifications
3A-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools
3A-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carburetor (20/25/JET 20)
3A-2
. . . . . . . . . . . . . . . . . . . . .
Carburetor (Seapro/Marathon 15/25 & Super 15)
3A-4
.
Carburetor Adjustments
3A-6
. . . . . . . . . . . . . . . . . . . . . . .
Low Speed Mixture Screw
3A-6
. . . . . . . . . . . . . . . . . .
Main Jet
3A-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Jet Chart
3A-7
. . . . . . . . . . . . . . . . . . . . .
Carburetor Float Adjustment
3A-8
. . . . . . . . . . . . . . . .
Carburetor Adjustments
3A-9
. . . . . . . . . . . . . . . . . . . .
Fuel System Troubleshooting
3A-15
. . . . . . . . . . . . . . . . .
General Information
3A-15
. . . . . . . . . . . . . . . . . . . . . .
Carburetor Removal
3A-18
. . . . . . . . . . . . . . . . . . . . . . . . .
Carburetor Installation
3A-19
. . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump
3A-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Disassembly
3A-22
. . . . . . . . . . . . . . . .
Cleaning and Inspection
3A-22
. . . . . . . . . . . . . . . . . . .
Reassembly and Installation
3A-22
. . . . . . . . . . . . . . .
Primer System
3A-23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symptoms of a defective primer system
3A-23
. . . . .
Servicing Sight Bowl Fuel Filter
3A-24
. . . . . . . . . . . . . . .
Specifications
CARBURETOR
SPECIFI-
CATIONS
Idle RPM (In Forward Gear)
Wide Open Throttle (WOT) RPM
20
25
Idle Mixture Screw
Adjustment (Preset-Turns Out)
20
20 Jet
25/25 Seapro/25 Marathon
Float Level
Main Jet Size
1994
1
/
2
thru 1996
-20 (WMC-44)
-25/20 Jet (WMC-45)
-25 Seapro/Marathon (WMC-46)
-25 Seapro/Marathon (WMC-46A)
1997 and Newer
-20 Jet (WMC-45)
-20 (WMC-52)
-25 (WMC-53)
-25 Seapro/Marathon (WMC-54)
750
±
50
4500 - 5500
5000 - 6000
1
±
1/4 Turn
1-1/2
±
1/2 Turn
1-1/4
±
1/4 Turn
1.0 in. (25.4 mm)
0.044 in. (1.12 mm)
0.076 in. (1.93 mm)
0.076 in. (1.93 mm)
0.080 in. (2.03 mm)
0.076 in. (1.93 mm)
0.044 in. (1.12 mm)
0.076 in. (1.93 mm)
0.080 in. (2.03 mm)
Special Tools
1. Carburetor Scale