Poor Performance At Low And Idle Speeds; Poor Performance At High Speed - Eton ATV8F Service Manual

18.2 Poor Performance At Low And Idle Speeds

CHECK IGNITION TIMING
O.K.
CHECK carburetor
AIR SCREW ADJUSTMENT
O.K
CHECK FOR LEAKING
INTAKE PIPE
O.K.
PERFORM SPARK TEST
SPARK

18.3 Poor Performance At High Speed

CHECK IGNITION TIMING
O.K.
CHECK FUEL TUBE AT
CARBURETOR
FUEL FLOWS FREELY
REMOVE CARBURETOR
CHECK FOR CLOGGED JETS
NOT CLOGGED
CHECK AIR CLEANER
FILTER ELEMENT
N.G.
N.G.
N.G
WEEK OR INTERMITTENT
N.G.
FUEL FLOW RESTRICTED
CLOGGED
DIRTY
Possibility
Faulty CDI unit or pulse generator
Improperly adjusted air screw
Deteriorated insulator o-ring
Loose carburetor
Loose or disconnected ignition system wires
Faulty ,carbon or wet fouled spark plug
Faulty alternator
Faulty CDI unit
Faulty ignition switch
Faulty ignition coil
Faulty pulse generator
Broken or shorted spark plug wire
Faulty engine stop switch
Possibility
Faulty CDI unit
Faulty pulse generator
Lack of fuel in tank
Clogged fuel line
Clogged fuel valve
Logged fuel tank breather hole
Clean with high pressure air gun
Clean the filter