Mercury 305 CID - Carburetor Adjustment Specifications; Carburetor Specifications

5C-2 - ROCHESTER 4 BARREL CARBURETOR 90-823225--1 1096
Carburetor Specifications
Model
Carb
Type
(Note)
Mercury No.
(Manufacturer No.)
Primary
Jet Size
Primary
Metering
Rods
Secondary
Metering
Rods
MCM 5.0LX
MIE 5.7L
Competition Ski
Rochester
4MV
Rochester
4MV
1347-9661
(17080565)
1347-9415
(17085013)
.069 In.
.069 In.
.042 In.
.042 In.
CL
CH
NOTE: Rochester Quadrajets are 4MV type. The “V” or “C” designates choke type, NOT bore size.
Carburetor Adjustment Specifications (Note 1)
Make & Model
Carburetor Manufacturer
Number
Float Level
Pump Rod Hole Location
Accelerator Pump (Note 2)
Air Valve Dashpot
(Air Valve Rod)
Vacuum Break
Air Valve Spring Windup
Choke Coil Rod(Note 3)
Idle Mixture Screw
Preliminary Setting
Float Weight (Max)
Rochester 4MV
17080565
15/64 (5.9)
Inner
23/64 (9.1)
.025 (0.64)
.080 [5/64] (2.0)
70-90 GR.
Top of Rod Even with
Bottom of Hole
2-3 Turns
8.3 GR.
Engine Model MCM 5.0LX
NOTE 1: All measurements are + 1/64 in. (0.4mm).
NOTE 2: Accelerator pump measurement taken from flame arrestor surface to pump stem with throttle plates
closed.
NOTE 3: Choke valve must be closed, choke rod in bottom of choke lever slot, and choke coil rod pushed down
to end of travel.
MIE 5.7L Competition Ski
Rochester 4MV
17085013
15/64 (5.9)
Inner
23/64 (9.1)
.025 (.64)
.080 [5/64] (2.0)
75-85 GR.
Top of Rod Even with
Bottom of Hole
2-3 Turns
8.3 GR.
UNIT OF MEASUREMENT
In. (mm)