wsm wg972-e4 Workshop Manual page 93

WG972-E4, WSM
Symptom
Deficient Output
Rough Low-speed
Operating And Idling
Probable Cause and
Checking Procedure
1. Fuel is insufficient
2. Damaged spark plug
3. Damaged ignition coil
4. Wires disconnection or
damaged
5. Bad connection of ignition
coil and spark plug
6. Clogged air cleaner
7. Insufficient oil in lubricating
system
8. Oil filter clogged
9. Improper valve clearance
10.Improper intake and
exhaust valve sealing
11.Excessive wear of rings
and liners
12.Excessive carbon in
engine
13.Improper clearance of
bearing
1. Damaged spark plug
2. Damaged ignition coil
3. Wires disconnection or
damaged
4. Bad connection of ignition
coil and spark plug
5. Improper valve clearance
6. Improper intake and
exhaust valve sealing
7. Excessive wear of rings
and liners
Solution
Check the fuel system
Check and adjust or replace
Check and replace
Check the wire harness
Reconnect or replace
Reconnect
Clean or replace
Check oil pressure and lubricating
Repair
Check and replace
Check the compression pressure
Adjust
Check the compression pressure
Check and replace
Check the compression pressure
Check and replace
Remove carbon
Check and adjust
Check and adjust or replace
Check and replace
Check the wire harness
Reconnect or replace
Reconnect
Check the compression pressure
Adjust
Check the compression pressure
Check and replace
Check the compression pressure
Check and replace
1-S2
ENGINE
Reference
Page
–
1-S20,
1-S21
1-S21
–
–
–
G-14, G-24
1-S16
1-S57
G-18
1-S14
1-S15
1-S14
1-S42
1-S14
1-S50,
1-S56
1-S40
1-S52,
1-S54,
1-S55
1-S20,
1-S21
1-S21
–
–
–
1-S14
1-S15
1-S14
1-S42
1-S14
1-S50,
1-S56
KiSC issued 07, 2015 A