Onan CCK Service Manual

IDLE FUEL
ADJUSTMENT
(Gas models only]
(Gas models only} ADJUSTMENT
CCK/CCKA
GASOLINE IDLE FUEL
cats
FIGURE 15. GAS-GASOUNE CARBURETORS
Gasoline Carburetor Adjustments
Start the engine and allow it to warm up until the
choke is completely open, then set the adjustment
screws as follows:
1. With no load, turn idle adjustment out until
engine speed drops slightly below normal. Figure
14. Then turn needle in until speed returns to
normal.
2. Apply a full load to engine.
3. Carefully turn main adjustment in until speed
drops slightly below normal. Then turn needle
out until speed returns to normal.
Alternate Method {No load adjustment possible)
1. Start engine and allow it to warm up.
2. Push in on governor mechanism to slow unit
down to about 400 to 500 rpm.
3. Set idle adjustment screw for even operation so
engine is firing on both cylinders and running
smoothly.
4. Release governor mechanism to allow engine to
accelerate. If the engine accelerates evenly and
without a lag, the main adjustment is correct If
not, adjustthe needle outward about 1/2 turn and
again slow down the engine and release the
mechanism. Continue until the engine accelerates
evenly and without a time lag after releasing the
governor.
Gas-Gasoline Carburetor Adjustments
When operating on gasoline, use the adjustment
procedures described under Gasoline Carburetor
Adjustments . Be sure the choke lock wire {Figure 15)
is removed. These carburetors are factory set for gas
rated approximately 1000 BTU. If fuel rating is
substantially different, a readjustment of the fuel
mixture is required.
1. Turn idle fuef adjusting screw out until engine
speed drops slightly {Figure 15). Then turn screw
in until speed returns to normal.
2. Apply a full load to engine.
3. Turn in gas main adjustment screw until engine
speed drops. Then turn out screw until engine
speed returns to normal.
Alternate Method (No load adjustment possible.)
1. Start engine and allow it to warm up.
2. Push in on governor mechanism to slow engine
down.to about 400 to 500 rpm.
3. Set idle fuel adjustment screw for even operation
so the engine is firing on both cylinders and
running smoothly.
22

Onan CCK Specifications

General

Cylinders	2
Ignition System	Battery ignition
Fuel Type	Gasoline
Cooling System	Air-cooled
Fuel System	Carburetor
Starter	Electric
Governor	Mechanical
Max RPM	1800 RPM
Engine Type	4-cycle
Bore and Stroke	3.25 x 3.625 inches (82.55 x 92.08 mm)