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I have a 2001 scrambler 90. I have replaced the stator and cdi box both from Ricks. It also has a new coil and spark plug. Just did fresh top-end due to low compression. It seems to have spark sometimes but its weak and then nothing. All wires and connections look good. I don't know were to go next?
 

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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)

IGNITION SYSTEM TROUBLESHOOTING
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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Welcome to the board!:med:
 

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Did anyone ever figure out what the issue was? I'm having the exact same issue now. Had now problem starting before top end rebuild and now has very weak spark if any. HELP!
 
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