MULTIQUIP WM90SE Operation Manual page 43

Symptom
Weak in power, compression is proper and
does not misfi re.
Weak in power, compression is proper but
misfi res.
Engine overheats.
Rotational speed fl uctuates.
Recoil starter malfunctions. (if applicable)
Burns too much fuel.
Exhaust color is continuously "white".
Exhaust color is continuously "black".
WM90 SERIES PLASTER/MORTAR MIXERS • OPERATION MANUAL — REV. #2 (10/30/19) — PAGE 43
TROUBLESHOOTING (ENGINE)
Troubleshooting (Engine) - continued
Possible Problem
Air cleaner dirty?
Improper level in carburetor?
Defective spark plug?
Improper spark plug?
Water in fuel system?
Dirty spark plug?
Ignition coil defective?
Spark plug heat value incorrect?
Wrong type of fuel?
Cooling fi ns dirty?
Intake air restricted?
Oil level too low or too high?
Governor adjusted incorrectly?
Governor spring defective?
Fuel fl ow restricted?
Recoil mechanism clogged with dust and dirt?
Spiral spring loose?
Over-accumulation of exhaust products?
Wrong spark plug?
Lubricating oil is wrong viscosity?
Worn rings?
Air cleaner clogged?
Choke valve set to incorrect position?
Carburetor defective, seal on carburetor
broken?
Poor carburetor adjustment, engine runs too
rich?
Solution
Clean or replace air cleaner.
Check fl oat adjustment, rebuild carburetor.
Clean or replace spark plug.
Set to proper gap.
Flush fuel system and replace with correct
type of fuel.
Clean or replace spark plug.
Replace ignition coil.
Replace with correct type of spark plug.
Replace with correct type of fuel.
Clean cooling fi ns.
Clear intake of dirt and debris. Replace air
cleaner elements as necessary.
Adjust oil to proper level.
Adjust governor.
Replace governor spring.
Check entire fuel system for leaks or clogs.
Clean recoil assembly with soap and water.
Replace spiral spring.
Check and clean valves. Check muffl er and
replace if necessary.
Replace spark plug with manufacturer's
suggested type.
Replace lubricating oil with correct viscosity.
Replace rings.
Clean or replace air cleaner.
Adjust choke valve to correct position.
Replace carburetor or seal.
Adjust carburetor.