Mariner Mercury 105/140 JET, Service Manual

Page: 176 / 797

3B-16 - FUEL SYSTEMS 90-824052R3 JUNE 2002
WMH 30,31,32,33,34,39 Carburetor Specifications
Carburetor Year Engine Venturi Main Jet Progres-
sion Jet
Idle Air Jet Back Draft
Vent Jet
WMH 30
1–2–3
1994-5 135 1.312 .066 .050 .054 .084
WMH 31
1–2–3
1994-5 105 JET
150
1.312 .062 .050 .052 .086
WMH 32
1–2–3
1994-5 XR-6
MAG III
1.312 .062 .040 .058 .090
WMH 33
1–2–3
1994-5 175 1.312 .064 .050 .048 .084
WMH 34
1A–2–3
1994-5 200 1.312
1,2=.066
3,4,5,6=.064
.050 .046 .084
WMH 39
1–2–3
1994-1/2
1995
140 JET
200
1.312
1,2=.066
3,4,5,6=.064
.050 046 .084
NOTE: All idle mixture settings are 1-1/2 turns
±
1/4
turn from a lightly seated position.
IMPORTANT: If welch plugs and air trim screws
must be removed for carburetor cleaning, count
number of turns air screw is turned in until
seated, then remove. Apply Loctite 271 and set
air screws to the same position (approx. 1-1/4
turns).
Top View
b a
g
f
c
d
e
50756
a - Fuel Mixture Adjustment
b - Screw Cap (two)
c - Welch Plug (two)
d - Air Trim Screw (two) - Apply Loctite 271
e - Idle Air Bleed Jet
f - Thermal Air Valve Air Inlet
g - Emulsion Tube