Troubleshooting; Engine Does Not Start - E-TON VIPER 50 ST Service Manual

13.TROUBLESHOOTING

13.1 ENGINE DOES NOT START

13.2 POOR PERFORMANCE AT LOW AND IDLE SPEEDS 13.5 POOR HANDLING
13.3 POOR PERFORMANCE AT HIGH SPEED
13.1 ENGINE DOES NOT START
CHECK FUEL FLOW TO CARBURETOR
O.K.
SPARK TEST
O.K.
TEST CYLINDER COMPRESSION
O.K.
START THE ENGING
ENGINE DOES NOT FIRE
REMOVE AND INSPECT SPARK PLUG
N.G.
N.G.
WEEK OR NO SPARK
N.G.
LOW COMPRESSION
ENGINE START BUT STOPS
WET PLUG
13.4 LOSS POWER
POSSSIBLE REASON
★ No fuel In fuel tank
★ Clogged float valve
★ Clogged fuel tank cap breather hole
★ Clogged at fuel tube
★ Faulty spark plug
★ Fouled spark plug
★ Faulty CDI unit
★ Faulty alternator
★ Faulty engine stop switch
★ Poorly connected ,broken or shorted wires
★ Broken or shorted ignition coil
★ Broken or shorted spark plug wire
★ Faulty pulse generator
★ Faulty ignition switch
★ Worn cylinder and piston rings
★ Damaged cylinder head gasket
★ Auto choke off or damaged
★ Auto choke power wire disconnected
★ Improperly adjusted air screw
★ Improperly ignition timing
★ Fuel / air mixture ratio is too lean
★ Carburetor flooded
★ Improperly adjusted air screw
★ Fuel / air mixture ratio too rich
★ Auto choke stuck or damaged
★ Air cleaner dirty