User Manual

8
Troubleshooting Guide for Gas Engines
Generally speaking, there are very few things that will keep today’s modern engines from starting. Use good quality “fresh” fuel and make sure good plugs are
installed. Should the engine fail to start after these items are verified, refer to the charts on the following page.
A) The engine does not start
B) The engine stops by itself
C) Lower power output
Seizure, intrusion of a foreign substance
The crankshaft does not rotate or is abnormally heavy
The carburetor has not been properly adjusted
The fuel is not suitable
Out of fuel
The crankshaft rotates
Air suction from a carburetor joint or oil seal
Clogging of the muffler or exhaust port due to carbon
Abrasion of the piston ring
The spark plug heat range is not proper
Not out of fuel
The plug cap has come off
The fuel is not fed to the carburetor
Put back
Repair
Clean
See A
Wiring is disconnected
Water is mixed in the fuel
Repair
Replace
Replace
Replace
Spark plug bridge Use a standard plug
Use clean fuel
The STOP switch has been turned off Turn ON
The fuel has not been fed to the carburetor
Clogging inside the carburetor
Clogging of the fuel piping
The crankshaft
does not rotate
Engine
suddenly stops
Overheating
Engine slows
down and stops
The crankshaft
does not rotate
Disassemble and repair
See A
Adjust
D) The engine does not stop
Overheating
The STOP switch is defective
Switch wiring is disconnected
Repair
Repair
See C
Replace
Refuel
Disassemble and clean
Clean
The fuel has been fed to the carburetor
No compression
(normally 7 kg/cm
2
99.5 psi or more)
Loosened Spark Plug Tighten further
Adequate Compression
Abrasion or damage of the cylinder,
piston or piston ring
The spark plug does not spark
The STOP switch has been turned off
Wet plug
Wiring is disconnected
The spark plug is defective
The air gap is too large
The ignition module is defective
The spark plug gap is too large
The carburetor has not been properly adjusted
The fuel is not suitable
Turn ON
Remove and dry the spark plug
Repair
Replace
Adjust
Replace
Adjust
Adjust
Replace
The spark plug does spark
Replace
In the event that none of the above procedures result in the engine running properly, contact our service department for suggestions:
Horizon Hobby, LLC.
2904 Research Road
Champaign, IL 61822
Phone: [phone] (M–F 8:00–5:00 CST)