Engine Troubleshooting - Chicago Electric 98706 Set Up, Operating, And Servicing Instructions

Problem: Low power output. Engine bogs down or dies under load. Excess exhaust or
unburned fuel in exhaust. See chart below:
Engine system
Ignition System
Fuel Supply System
Poor Compression
Problem: Engine does not start or does not run smoothly. See chart below:
Symptom
Engine is Pinging
Abnormal Com-
bustion or engine
running hot or
excess smoking.
Engine does not
start.
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Engine Troubleshooting

possible Cause
Incorrect Ignition Timing.
1. Air in fuel line or fuel line clogged.
2. Main Jet not adjusted properly.
3. Metering Jet or Main Jet clogged.
4. Fuel Cock clogged.
5. Carbon Fouling in Combustion
Chamber.
6. Clogged Air Filter.
7. Intake Manifold leaking.
1. Worn Piston, Piston Ring or
Cylinder Wall.
2. Leaking Cylinder Head Gasket.
3. Worn Valves, Valve Seats, Stems
or Valve Guides.
Possible Cause
Excess wear of:
• Piston, Cylinder Wall or Rings.
• Piston Pin or Piston Pin Hole.
• Connecting Rod Wrist Pin.
• Crankshaft Roller Bearing.
1. Combustion chamber carbon
fouling.
2. Dirty or old gasoline or oil in gas.
1. Engine Switch in OFF position.
2. Water in Carburetor Bowl.
3. Spark Plug gap not correct.
4. Incorrect Ignition Timing.
5. Damaged coil or ignition wires.
6. Low Oil level.
possible solution
Adjust Engine Advance Angle.
1. Purge air or clear obstruction.
2. Readjust Main Jet.
3. Clean and Readjust.
4. Clean or replace as needed.
5. Clean out Combustion Chamber.
6. Clean or replace Air Filter.
7. Repair or replace as needed.
1. Check compression and wear
tolerances, repair or replace as
needed.
2. Check compression, replace as
needed.
3. Check wear tolerances, repair or
replace as needed.
Possible Solution
Check wear, replace as needed.
1. Clean out Combustion chamber and
spark plug.
2. Drain gas, clean out fuel filter and
replace with fresh gas, minimum 91
octane premium unleaded gasoline.
1. Move Switch to ON position.
2. Drain carburetor Bowl, clean Fuel
Filter.
3. Clean and re-gap plug at 0.030".
Replace plug if needed.
4. Check timing and adjust.
5. Check for damaged wires, test output.
6. Check oil level, top off as needed.
REv 08g
SKU 98706