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Troubleshooting (Engine) - continued
Symptom
Possible Problem
Solution
Weak in power, compression is
proper and does not misfire.
Air cleaner dirty?
Clean or replace air cleaner.
Improper level in carburetor?
Check float adjustment, rebuild
carburetor.
Defective spark plug?
Clean or replace spark plug.
Improper spark plug?
Set to proper gap.
Weak in power, compression is
proper but misfires.
Water in fuel system?
Flush fuel system and replace with
correct type of fuel.
Dirty spark plug?
Clean or replace spark plug.
Ignition coil defective?
Replace ignition coil.
Engine overheats.
Spark plug heat value incorrect?
Replace with correct type of spark
plug.
Wrong type of fuel?
Replace with correct type of fuel.
Cooling fins dirty?
Clean cooling fins.
Intake air restricted?
Clear intake of dirt and debris.
Replace air cleaner elements as
necessary.
Oil level too low or too high?
Adjust oil to proper level.
Rotational speed fluctuates.
Governor adjusted incorrectly?
Adjust governor.
Governor spring defective?
Replace governor spring.
Fuel flow restricted?
Check entire fuel system for leaks or
clogs.
Recoil starter malfunctions. (if
applicable)
Recoil mechanism clogged with dust
and dirt?
Clean recoil assembly with soap and
water.
Spiral spring loose?
Replace spiral spring.
Starter malfunctions.
Loose, damaged wiring?
Ensure tight, clean connections on
battery and starter.
Battery insufficiently charged?
Recharge or replace battery.
Starter damaged or internally shorted? Replace starter.
Burns too much fuel.
Over-accumulation of exhaust products?
Check and clean valves. Check
muffler and replace if necessary.
Wrong spark plug?
Replace spark plug with
manufacturer's suggested type.
Exhaust color is continuously "white". Lubricating oil is wrong viscosity?
Replace lubricating oil with correct
viscosity.
Worn rings?
Replace rings.
Exhaust color is continuously "black".
Air cleaner clogged?
Clean or replace air cleaner.
Choke valve set to incorrect position?
Adjust choke valve to correct position.
Carburetor defective, seal on carburetor
broken?
Replace carburetor or seal.
Poor carburetor adjustment, engine runs
too rich?
Adjust carburetor.
Will not start, no power with key
"ON". (if applicable)
ON/OFF device not activated ON?
Turn on ON/OFF device.
Battery disconnected or discharged?
Check cable connections. Charge or
replace battery
Ignition switch/wiring defective?
Replace ignition switch. Check wiring.
