Onan CCK Service Manual

IF ENGINE HAS A 6 VOLT
COIL
FIGURE 34. BATTERY IGNITION SYSTEM (12 VOLT)
place drop of oil on pivot point
WHENEVER NEW POINTS ARE
INSTALLED.
REFERENCE MARk7
FOR
APPROXIMATE TIMING
‘LOOSEN SCREWS
-AND SHIFT BOX-
TO ADVANCE OR RETARD
FIGURE 35. IGNITION TIMING
timing after replacing ignition points or if noticing
poor engine performance- Proceed as follows:
1. To accurately check the ignition timing, use a
timing light when engine is running. Connect the
timing light according to its manufacturer’s
instructions. Either spark plug can be used as
they fire simultaneously.
2. Place a white chalk or paint mark on the timing
mark.
3. Start the engine and check the timing.
4. If timing needs adjustment, loosen the mounting
screws on breaker box and move it left to advance
or right to retard the timing.
5. Tighten the screws on the breaker box and
recheck timing.
6. Replace breaker box cover and any other
hardware removed.
Ignition Timing — Engine Not Running
1. Connect a continuity test lamp set across the
ignition breaker points. Touch one test prod to
the breaker box terminal to which the coil lead is
connected and touch the other test prod to a good
ground on the engine.
2. Turn crankshaft against rotation
(counterclockwise) until the points close. Then
slowly turn the crankshaft with rotation
(clockwise).
3. The lamp should go out just as the points break.
4. If timing needs adjustment, loosen the mounting
screws on breaker box and move it leftto advance
or right to retard the timing.
Spark Advance Mechanism (Figure 36): The spark
advance mechanism is located on the rear of the
camshaft and is standard on magneto models. It is
operated by centrifugal force. As the .engine speeds
up, the weights rotate the cam and advance the spark.
The cam returns to the retarded position as the engine
speed is decreased. If the mechanism should become
dirty or gummy, it would remain closed (retarded),
causing the engine to lose power. If the mechanism
remains open (advanced), the engine would possibly
kick back on cranking. The cam advance must
operate freely. Some units are snap acting. Should
the engine fail to pick up speed ortend to alternately
increase and decrease speed, the mechanism may
require cleaning.
The spark advance mechanism can be reached for
cleaning by either removing the cup shaped cover in
the crankcase rear camshaft opening to expose the
mechanism or by removing the camshaft from the
engine. Do not indent the cup shaped cover as it will
interfere with the weight mechanism.
38

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)