Specifications

46
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MalfunctionAnalysisandElimination
（I）Enginemalfunction
Malfunction
phenomenon
Malfunction
system
Reason Solvingmethod
Startingdifficultlyor
failuretostart
Lowcompression 1. Cylinderwornout
2. Pistonwornout
3. Wornorbrokenpistonrings
4. Valveleak
5. Plugisloose
6. Startingmotoristooslow
7. Aircirculationisnotright
8. Gapofvalveisincorrect
Change
Change
Change
Repair
orchange
Tighten
Checkbattery
adjust
Adjust
Noignition
generatedfrom
plug
1. Dirtonsparkplug
2. Wetorfouledsparkplug
3. Ignitioncoilproblem
4. Faultyignitionswitch
5. Magnetoproblem
6. ECUproblem
Cleanorchange
Clean,dryorchange
Change
Change
Change
Change
NofuelinThrottle
body
1. Ventpluggedonfueltank
2. Pluggedinjector
3. Fuelpumpfailure
4. Lowfuelpressure

5. Pluggedfuelfilter
Clean
Cleanorchange
Cleanorchange
Cleanorchangefuel
pump
Cleanorchange
Miscellaneous Gearisnotinneutral Putgearonneutral
Erraticidleorwon’tidle. Mechanical
reasons
1. Valvegapisincorrect
2. Wornorleakingvalve
3. Blockedexhaust
4. Incorrectidleadjustment
Adjust
Repairorreplace
Replace
Adjust
Electricparts
problem
1. Fouledordirtysparkplug
2. Gapofplugnotcorrect
3. Ignitionswitchproblem
4. ECUproblem
5. Magnetoproblem
Cleanorchange
Changeoradjust
Change
Change
Change
Poormidtohighrpm
performance
Mechanical
problem
1. Weakvalvespring
2. Worncamshaft
3. Dirtysparkplug
4. Gapofplugistoosmall.
5. Aircirculationisnotright.
6. Airfilterisdirty.
7. Fuellinerestriction
8. Lowfuelpressure 
Change
Change
Changeorclean
Gapproperly
Adjustorchange
Change
Cleanorchange
Changefuelpump
BlueexhaustsmokeMechanicalfault 1. Oiloverfilled
2. Pistonringwornout
3. Valvewornorburned
4. Cylinderwallscratched

5. Wornvalveseal
Draintheextraoil
Change
Change
Repairorchangeas
necessary
Change
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