Polaris 2009 Trail Boss 330 Service Manual page 208

ELECTRICAL
IGNITION SYSTEM
TROUBLESHOOTING
No Spark, Weak or Intermittent Spark
GNo 12 volt power or ground to CDI
GSpark plug gap incorrect
GFouled spark plug
GFaulty spark plug cap or poor
connection to high tension lead
GRelated wiring loose, disconnected,
shorted, or corroded
GEngine Stop switch or ignition switch
faulty
GETC switch misadjusted or faulty
GPoor ignition coil ground (e.g. coil
mount loose or corroded)
GFaulty stator (measure resistance of
all ignition related windings)
GIncorrect wiring (inspect color coding
in connectors etc)
GFaulty ignition coil winding (measure
resistance of primary and
secondary)
GWorn magneto (RH) end Crankshaft
bearings
GSheared flywheel key
GFlywheel loose or damaged
GExcessive crankshaft runout on
magneto (RH) end - should not
exceed .005"
GFaulty CDI module
10.16
CDI OUTPUT TEST USING
PEAK READING ADAPTOR
Re-connect all CDI wires to stator wires. Disconnect
CDI module wire from ignition coil primary terminal.
Connect one meter lead to engine ground and the
other to the ignition coil primary wire leading from the
CDI module. Set meter to read DC Volts. Crank
engine and check output of CDI wire to coil.
Reconnect CDI wire to coil.
Output w/ Peak output tester
130 Vdc
Average Output w/ Digital Voltmeter
20 Vdc