12. Troubleshooting
Unstable Engine Running or Engine Stops
No petrol in fuel tank
No fuel Clogged fuel hose
Clogged float valve
With Fuel Clogged fuel filter
Clogged fuel tank cap breather hole
Stained, damaged and color changed
Stained or damaged spark plug
Improper spark plug heat value
Normal Spark Plug
Weak spark or Faulty spark plug or stained spark plug
No spark Faulty Ignition coil
Faulty high tension coil or short circuit
Faulty ignition switch
Normal Spark Faulty pickup coil
Faulty CDI unit
Low or no Worn Cylinder and piston ring
compression Faulty cylinder gasket
pressure
Normal compression pressure
Incorrect Faulty pickup coil
Faulty CDI unit
Correct
Improper adjustment Refer to Engine Service
Correct adjustment
Air intake Faulty tightening of carburetor joint
No secondary air
No continuity Broken cable of fuel enrichment device
Faulty fuel enrichment device
Normal Continuity
12-2
Loosen drain screw, and check
the if fuel has reached carburetor
Remove spark plug
and check it
Remove spark plug and mount it
to spark plug cap, get it earthed
and check spark
Measure compression pressure
with pressure meter
Check ignition timing
Check caburetor
mixture screw
Check if there is
secondary air into
carburetor joint
Remove fuel enrichment
device wire lead and
check continuity
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