Onan CCK Service Manual

In general, overhauling acarburetor consists of com¬
plete disassembly, a thorough cleaning, and replace¬
ment of worn parts. Carburetor repair parts are
available.
General instructions for overhauling a carburetor are
given below. Carefully note the position of all parts
while removing to assure correct placement when
reassem bling. Read through all the instructions be¬
fore beginning for a better understanding of the
procedures involved. Carburetor components are
shown in Figure 17.
Carburetor Disassembly
(Gasoline and Gas-Gasoline Only)
1. If engine is equipped with an automatic choke,
remove two screws that fasten the choke to the
carburetor and remove assembly.
Always perform carburetor repair under cleanest conditions
possible.
2. Remove throttle and choke plate retai ni ng screws,
then plates. Pull out throttle and choke shafts,
being careful not to damage the teflon coating
applied to some throttle shafts.
3. Remove main and idle adjustment screw assem¬
blies.
4. On downdraft carburetors, remove attaching
screws and separate upper and lower carburetor
sections. On sidedraft models, unscrew the re¬
taining screw and remove fuel bowl from the
upper carburetor body.
5. Carefully note position of float assembly parts,
then slide out retaining pin and remove the float
assembly, and springs or clips, and the needle
valve.
6. Unscrew and remove needle valve seat.
Cleaning and Repair
Carburetor maintenance should consist of regular
cleaning. Some gasolines have a tendency toward
formation of gum deposits inside the carburetor.
1. Soak all metal components not replaced in car¬
buretor cleaner. Do not soak non-metal floats or
other non-metal parts. Follow the cleaning manu¬
facturer’s recommendations.
2. Clean alt carbon from the carburetor bore, esp-
cially where the throttle and choke plates seat. Be
careful not to plug the idle or main fuel ports.
3. Dry out all passages with low pressure air (35
PSI). Avoid using wire or other objects for clean¬
ing that may increase thesize of critical passages.
4. Check the condition of adjustment needle? re¬
place if damaged. Replace float if loaded with fuel
or damaged.
5. Check the choke and throttle shafts for excessive
play in their bore and replace if necessary.
6. Replace old components with new parts.
Carburetor repair and gasket kits are available from your nearest
Onan Parts Center.
24

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)