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Recently just bought a 1999 400ex sportrax and ride fine the first couple of days then yesterday it cut out and I have no spark. What should I check first and what would be the best diagnostic procedure to find my issue?
 

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The 400EX has AC excited ignition - it does not need a battery to run

Spark is killed by grounding the CDI - there is a black/white wire on the CDI box, connect it to ground (green wire) and the spark goes away

If disconnecting the b/w wire does not get the spark back, then the problem is in the ignition system - the ignition system consists of the spark plug, spark plug cap, coil, CDI box, stator, flywheel and the wiring connecting everything. 90% of all electrical problems are connection related and 90% of all bad connections are ground connections. After disconnecting the b/w wire, check all ignition related ground connections, then check all other connections then start checking components.
 
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