Mariner Mercury 105/140 JET, Service Manual

Page: 164 / 797

3B-4 - FUEL SYSTEMS 90-824052R3 JUNE 2002
WMH 1,2,3,4,5,6,7,8,9,10,11 Carburetor Specifications
Carburetor Year Engine Venturi Main Jet Progres-
sion Jet
Idle Air Jet Back Draft
Vent Jet
WMH 1
1A–2A–3A
1990 150 1.312 .062 .044 .040 .084
WMH 2
1A–2A–3A
1990 175 1.312 .064 .044 .044 .080
WMH 3
1C–2C–3C
1990 200 1.312 .066 .034 .040 .082
WMH 4*
1–2–3
1990 XR-4
MAG II
1.312 .062 .030 .044 NONE
WMH 5
1A–2A–3A
1990 135 1.000 .050 .036 .048 .070
WMH 6*
1A–2A–3A
1990 -1/2 XR-4
MAG II
1.312 .062 .030 .042 NONE
WMH 7
1–2–3
1990-1/2 150 1.312 .062 .034 .040 NONE
WMH 8
1A–2A–3A
1990-1/2 135 1.000 .050 .040 .048 NONE
WMH 9
1C–2C–3C
1991 150 1.312 .062 .070 .046 .096
WMH 10
1–2–3
1991 XR-4
MAG II
1.312 .062 .040 .040 NONE
WMH 11
1A–2A–3A
1991 175 1.312 .064 .070 .048 .080
*Supercede WMH 4 and WMH 6 carburetors with
WMH 26 carburetors.
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