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Join Date: Jan 2011
Location: Smack in the middle of Illinois
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The wiring on the TRX250X after 07 is very similar to the wiring on the 400EX. The spark is killed when the black wire with the white stripe is connected to ground. The battery is not required to start the engine other than running the starter motor. Start with a new spark plug, make sure the handlebar kill switch in in the run position and the key switch is turned on - if you push it in gear, you should have spark. If not unplug the key switch and try again - if still no spark, unplug the black/white wire going to the handlebar kill switch - if still no spark, unplug the b/w wire near the CDI unit, if still no spark then you have a problem with the ignition system - maybe a fouled plug?