5.3
Section 5
Fuel System and Governor
5
1. Low idle fuel mixture/speed improperly adjusted. Adjust the low idle
speed RPM, then adjust the low idle fuel needle.
Possible Cause/Probable Remedy
Condition
1. Engine starts hard, runs
roughly or stalls at idle
speed.
Troubleshooting – Carburetor Related Causes
2a. Clogged air cleaner. Clean or replace.
b. Choke partially closed during operation. Check the choke lever/linkage to
ensure choke is operating properly.
c. Low idle fuel mixture is improperly adjusted. Adjust low idle fuel needle.
d. Float level is too high. Separate carburetor bowl from carburetor body,
check float setting against specification. Replace float if required.
e. Dirt under the fuel inlet needle. Remove needle; clean needle and seat
and blow out with compressed air.
f. Bowl vent pilot jet or air bleeds plugged. Remove low idle fuel adjusting
needle. Clean vent, ports, and air bleeds. Blow out all passages with
compressed air.
g. Leaky, cracked, or damaged float. Submerge float to check for leaks.
2. Engine runs rich.
(indicated by black, sooty
exhaust smoke, misfiring,
loss of speed and power,
governor hunting, or
excessive throttle
opening.)
3. Engine runs lean.
(indicated by misfiring,
loss of speed and power,
governor hunting, or
excessive throttle
opening.)
4. Fuel leaks from carburetor.
3a. Low idle fuel mixture is improperly adjusted. Adjust low idle fuel needle.
b. Float level is too low. Separate carburetor bowl from carburetor body,
check float setting against specification. Replace float if required.
c. Idle holes plugged; dirt in fuel delivery channels. Remove low idle fuel
adjusting needle. Clean main fuel jet and all passages; blow out with
compressed air.
4a. Float level too high. See Remedy 2d.
b. Dirt under fuel inlet needle. See Remedy 2e.
c. Bowl vent plugged. Blow out with compressed air.
d. Carburetor bowl gasket leaks. Replace gasket.
Troubleshooting Checklist
If engine troubles are experienced that appear to be
fuel system related, check the following areas before
adjusting or disassembling the carburetor.
•
Make sure the fuel tank is filled with clean, fresh
gasoline.
•
Make sure the fuel cap vent and inlet filter are not
blocked and operating properly.
•
Make sure fuel is reaching the carburetor. This
includes checking the fuel shut-off valve, screen
filters, and fuel lines for restrictions.
•
Make sure the air cleaner base and carburetor
are securely fastened to the engine using gaskets
in good condition.
•
Make sure the air cleaner element is clean and all
air cleaner components are fastened securely.
•
Make sure the ignition system, governor system,
exhaust system, and throttle and choke controls
are operating properly.
If, after checking all items listed above, the engine is
hard to start, runs roughly, or stalls at low idle speed, it
may be necessary to adjust or service the carburetor.
Содержание COMMAND PRO CS10
Страница 1: ...SERVICE MANUAL COMMAND PRO CS SERIES 4 12 HP HORIZONTAL CRANKSHAFT...
Страница 20: ...1 18 Section 1 Safety and General Information...
Страница 24: ...2 4 Section 2 Special Tools...
Страница 48: ...6 4 Section 6 Lubrication System...
Страница 54: ...7 6 Section 7 Retractable Starter...
Страница 84: ...8 30 Section 8 Electrical System and Components...
Страница 106: ...9 22 Section 9 Disassembly...
Страница 122: ...10 16 Section 10 Internal Components...
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