Trail Tech Tech Support
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YFZ450 Quad with stock regulator/rectifier and stator. The stock lights are completely removed, and the quad now has starting issues. What is wrong?
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Answer: If you do not load the AC system, it will trigger the voltage regulator to shunt the stator (shunt=short=no power output). If the regulator shunts the stator, you get no DC. If you get no DC, your battery will die. If your battery dies, your quad will die. The first symptoms are mid throttle breakup.
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My YFZ450 has no spark.
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Answer: There are two white wires with black stripe on the wiring harness. If 12 volts DC is applied to either one of them, the bike will spark. You have to get 12 volts DC to one of the wires. Beyond the stator, there are a number of issues that could cause a problem with the bike sparking (e.g. sheared flywheel key, bad CDI, shorted wires, etc). Generally speaking, the YFZ does not need the stator to spark, only to charge the battery. As long as the white wire with black stripe has 12 volts DC, the bike should run, all other things being OK.
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YFZ450 with stripped wiring harness and Trail Tech DC stator conversion and a capacitor. Quad won't start. What is wrong?
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Answer: try the OEM battery in place of the capacitor to see if that cleans things up.
You can also get a voltmeter and check voltage on the white wire with black stripe. If it is 12 volts, then the problem is not an ignition related issue, and they must look elsewhere for the problem.
Note: If the bike is the WR, the wire in question is white.
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