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OM-4405 Page 38
8-6. Adjusting Engine Idle Speed
802 731 / Ref. 115 155-A
Y Stop engine and let cool.
Engine idle speed is factory set and
normally should not require adjust-
ment. After tuning engine, check
engine speed with tachometer or
frequency meter. See table for
proper no load speed. If necessary,
adjust idle speed as follows:
Start engine and run until warm.
On CC Models, place Stick/TIG
switch in Stick position.
On CC/CV models, turn Process/
Contactor switch to Stick – Elec-
trode Hot position.
1 Solenoid Bracket Screws
2 Throttle Arm
3 Idle Speed Screw
4 Throttle Stop
Loosen bracket screws and move
arm so screw touches stop. Do not
release arm. Turn idle speed screw
to obtain 550 rpm.
5 Idle Mixture Screw
Turn mixture screw counterclock-
wise until engine falters, then turn
screw clockwise until engine runs
smoothly.
Turn idle speed screw to obtain
1250 rpm.
6 Solenoid
7 Plunger
Slide solenoid inside bracket so
plunger bottoms in solenoid. If nec-
essary, shim solenoid/bracket to
prevent linkage from binding. Do
not readjust idle speed screw when
adjusting solenoid.
Tighten bracket screws. Release
throttle arm. Recheck idle speed
and readjust if necessary.
Y Stop engine.
Close door.
Tools Needed:
1
2
3
4
5
6
7
1/4 in
1850 rpm max
(61.6 Hz)
1250 rpm
(41.6 Hz)
Engine Speed
(No Load)