Troubleshooting - MULTIQUIP LD6 Operation Manual

Symptom
Diffi cult to start, fuel is available, but no spark at
spark plug.
Diffi cult to start, fuel is available, and spark is
present at the spark plug.
Diffi cult to start, fuel is available, spark is
present and compression is normal.
Diffi cult to start, fuel is available, spark is
present and compression is low.
LD6 RIDE-ON POWER TROWEL • OPERATION MANUAL — REV. #0 (02/10/20) — PAGE 45
Engine Troubleshooting
Possible Problem
Spark plug bridging?
Carbon deposit on spark plug?
Short circuit due to defi cient spark plug
insulation?
Improper spark plug gap?
Spark plug is red?
Spark plug is bluish white?
No spark present at tip of spark plug?
No oil?
Oil pressure alarm lamp blinks upon starting?
(if applicable)
ON/OFF switch is shorted?
Ignition coil defective?
Improper spark gap, points dirty?
Condenser insulation worn or short circuiting?
Spark plug wire broken or short circuiting?
Wrong fuel type?
Water or dust in fuel system?
Air cleaner dirty?
Suction/exhaust valve stuck or protruded?
Piston ring and/or cylinder worn?
Cylinder head and/or spark plug not tightened
properly?
Head gasket and/or spark plug gasket damaged?

TROUBLESHOOTING

Solution
Check gap, insulation or replace spark plug.
Clean or replace spark plug.
Check spark plug insulation, replace if worn.
Set to proper gap.
Check transistor ignition unit.
If insuffi cient compression, repair or replace
engine. If injected air leaking, correct leak. If
carburetor jets clogged, clean carburetor.
Check transistor ignition unit is broken, and
replace defective unit. Check if voltage cord
cracked or broken and replace. Check if spark
plug is fouled and replace.
Add oil as required.
Check automatic shutdown circuit, oil sensor.
(if applicable)
Check switch wiring, replace switch.
Replace ignition coil.
Set correct spark gap and clean points.
Replace condenser.
Replace defective spark plug wiring.
Flush fuel system, replace with correct type of fuel.
Flush fuel system.
Replace air cleaner.
Reseat valves.
Replace piston rings and/or piston.
Torque cylinder head bolts and spark plug.
Replace head and spark plug gaskets.