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Discussion Starter · #1 ·
Alright guys I'm a little new to the four wheeler scene. My son's 03 Sportsman 90 is getting no spark. It was running great when we shut it off. We tried to start it an hour later and no spark. No power to the ignition coil so my next question is, how do I check ohms/amperage to the cdi box and how would I even begin to start diagnosis? There's power coming out of the shut off switch on the handlebar......

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Engine Turns Over But Fails to Start
 No fuel
 Dirt in fuel line or filter
 Fuel will not pass through fuel valve
 Fuel pump inoperative/restricted
 Tank vent plugged
 Carb starter circuit
 Engine flooded
 Low compression (high cylinder leakage)
 No spark (Spark plug fouled)

No Spark, Weak or Intermittent Spark
Spark plug gap incorrect
Fouled spark plug
Faulty spark plug cap or poor connection to high tension lead
Related wiring loose, disconnected, shorted, or corroded
Engine Stop switch or ignition switch faulty
ETC switch misadjusted or faulty
Terminal board or connections wet, corroded
Poor ignition coil ground (e.g. coil mount loose or corroded)
Faulty stator (measure resistance of all ignition related windings)
Incorrect wiring (inspect color coding in connectors etc)
Faulty ignition coil winding (measure resistance of primary and secondary)
Worn magneto (RH) end Crankshaft bearings
Sheared flywheel key
Flywheel loose or damaged
Excessive crankshaft runout on magneto (RH) end - should not exceed .0024″
Faulty CDI module
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