MERCARB 2 BARREL CARBURETOR - 5B-990-823225--1 1096
Choke Setting
Normal choke setting is such that scribed mark on
cover is in line with long case mark on choke hous-
ing.
72403
b
c
a
a - Scribed Mark
b - More Choke
c - Less Choke
If choke adjustment is necessary:
1. Loosen three choke cover retaining screws and
adjust as shown.
2. Tighten three choke cover retaining screws se-
curely.
Choke Unloader
1. Hold throttle valves completely open.
2. Gently press down on choke plate.
3. Using an .080 in. [5/64 in.] (0.2 mm) drill rod, or
appropriate gauge, slide rod between upper
edge of choke plate and air horn assembly. Rod
should just slide through.
72684
b
c
a
a - .080 In. (0.2mm) Drill Rod
b - Choke Plate
c - Air Horn
4. Bend tang on throttle lever, if necessary, to obtain
specified dimension.
72685
b
a
a - Tang
b - Throttle Lever
Preliminary Idle Speed and Mixture
IMPORTANT: The following adjustments will pro-
vide a sufficient idle speed and mixture for start-
ing engine. Final adjustments must be made with
engine running.
1. Back out idle speed screw until it no longer con-
tacts idle cam. Turn idle speed screw in until it just
contacts idle cam, then turn screw in an addition-
al two turns.
72284
b
a
a - Idle Speed Screw
b - Idle Cam
IMPORTANT: DO NOT turn idle mixture needle
tightly against seat (in the following step), as
damage to seat and/or needle may result.
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