42
Troubleshooting
If the engine malfunctions perform diagnosis by referring to the following table and then taking the appropriate
action.
Effect
Possible cause
Treatment
You have trouble
starting the
machine, or the
machine will not
start at all.
Safety switch is not in the [start up] position.
Put the safety switch to the [start up] position.
Choke lever has not been pulled out.
When cooling the engine, put the choke bar in the
position.
Fuel is not flowing properly.
Inspect fuel tank, remove impure deposits or water.
Remove the fuel valve strainer and clean out any
sediment deposited inside the cap along with any other
attached dirt.
There is air or water mixed in the fuel
delivery system.
Remove foreign object, inspect fastening bands, replace
damaged parts with new ones.
In cold weather, oil becomes thick, and so
the rotation of the engine heavy.
Use the correct oil depending on the outside temperature.
Ignition coil or unit is defective.
Replace the ignition coil or unit.
Defective spark plug.
Inspect the gap between spark plug electrodes and
adjust.
Replace with new spark plug.
Output shortage
Fuel shortage.
Refuel the machine.
Clogged air filter.
Clean the element.
Poor quality fuel.
Replace with good quality fuel.
Choke has not been fully opened.
Return the choke bar completely.
Put it in the
position.
Cooling system is clogged.
Clean around the recoil starter.
The machine stops
suddenly.
Fuel shortage.
Refuel the machine.
Fuel valve is closed.
Open the fuel valve.
Exhaust gas is
abnormally black
Poor quality fuel.
Replace with good quality fuel.
Overfilled with engine oil.
See that oil level is straight.
Muffler emits black
smoke and power
output falls.
Air filter element is clogged.
Clean the element.
Choke has not been fully opened.
Return the choke bar completely.
Put it in the
position.
Muffler emits gray
smoke.
Overfilled with engine oil.
Check that oil level is straight.
Cylinder or piston ring is worn out
Replace the ring.
Engine power is
not stable (does
not increase).
Choke has not been fully opened.
Return the choke bar completely.
Put it in the position
Poor quality fuel.
Replace with good quality fuel.
Momentary stall.
Defective ignition coil.
Replace the ignition coil.
Fuel filter is clogged.
Clean the fuel filter.
Exhaust has an
abnormal odor.
Poor quality fuel.
Replace with good quality fuel.
If you do not understand any of these points, please consult with the retailer where you purchased this machine.
