Kohler l654 Service Manual page 14

CONDITION
A. Hard Starting or Loss of Power
B. Overheating
C. Backfiring
D. Occasional "skip" at High Speed
E.
Operating Erratically
POSSIBLE CAUSE
1. Faulty Ignition.
a. Loose or grounded high tension or breaker point leads.
b. Improper breaker point gap and timing.
c. Defective breaker points.
d. Faulty spark plug or improper gap.
e. Faulty condenser or coil.
f. Weak battery.
2. Faulty Fuel System.
a. Gasoline not getting to carburetor.
A. Dirt or gum in fuel line.
B. Fuel pump faulty.
b. Dirt in carburetor.
c. Carburetor improperly adjusted.
d. Choke faulty or improperly adjusted.
e. Stale fuel.
f. Carbon build up.
g. Possible intake manifold vacuum leak.
3. Valve maintenance.
4. Defective Automatic Compression Release (ACR).
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Insufficient available cool air.
Dirty air intake screen, shroud or cooling fins.
Stale fuel.
Fuel mixture too lean.
Improper ignition timing.
Engine overloaded.
Tight tappet clearance.
Insufficient hot-air discharge opening.
Loose or broken fan belt (7.5kW).
Low coolant level (7.5kW).
Too much lube oil.
Summer/Winter air baffle in wrong position.
'I. Fuel mixture too lean.
2. Improper timing.
3. Valve "sticking".
4. Possible intake manifold vacuum leak.
1. Spark plug gap too wide.
2. Improper carburetor setting or lack of fuel.
3. Wrong type spark plug. Use resistor type plug.
4. Improper timing.
5. Faulty condenser.
1:
2.
3.
4.
5.
6.
7.
8.
9.
IO.
Clogged fuel line.
Water in fuel.
Faulty choke control.
Improper fuel mixture.
Loose ignition connections.
Vacuum leaks in manifold or carburetor connection.
Vent in gas cap plugged.
Fuel pump faulty.
4CR installed upside down. Solenoid should be to the bottom.
Improper ground on anti-dieseling device.
Table 4-1. Engine Troubleshooting
Refer to Kohler Engine Service Manual for Repair.
defer to Generator Owner's Manual for Adjustments.
4-3