37
TROUBLESHOOTING
EN
GLISH
TROUBLESHOOTING
The engine malfunctions can result from a large number of causes. The following describes symptoms that are
encountered relatively more often than others, their major causes and remedies.
B
When it is difficult to start the engine
B
When output is insufficient
Cause
Countermeasures
Fuel doesn't flow.
*
*
Check the fuel tank, fuel filter, fuel hoses and fuel pump.
As fuel will be filtered by the filter, if there should be water
or other foreign matters on the filter, clean the filter.
Valve clearance is not as specified.
* Adjust valve clearance when the engine is cold.
Engine oil becomes thick in cold
weather and engine cranks slow.
*
Change grade of oil according to the weather
(temperature).
Low compression
*
Bad valve or excessive wear of rings, pistons and liners
cause insufficient compression. Replace with new parts.
Battery is discharged and the engine
will not crank.
*
*
Charge battery.
In winter, always remove battery from machine, charge
fully and keep indoors. Install in machine at time of use.
Clogged air cleaner
* Clean or replace.
Spark plug electrodes are wet with
gasoline
* Dry electrode and restart.
Defective starter
* Repair or replace.
Defective main switch
* Repair or replace.
Defective vaporizer
* Replace.
Defective lock off valve
* Replace.
Disconnection
* Check the wire harness.
Cause
Countermeasures
Compression is insufficient.
*
Bad valve or excessive wear of rings, pistons and liners
cause insufficient compression. Replace with new parts.
Fuel is insufficient.
* Check fuel system.
Overheating of moving parts
*
*
*
*
Check lubricating oil system.
Check to see if lubricating oil filter is working properly.
Filter element deposited with impurities would cause poor
lubrication. Change element.
Check to see if the clearance of bearing is within factory specs.
Valve clearance is not as specified.
* Adjust valve clearance when the engine is cold.
Air cleaner is dirty.
* Clean or replace.
Defective spark plug
* Clean or replace.
Defective ignition coil
* Replace.
Disconnection
* Check the wire harness.
EG523-8917_E.book Page 37 Friday, May 17, 2019 10:32 AM
