I'm looking at a wiring diagram for a eton viper rxl40e from AnythingATV.com. Does this sound like your quad?
If the wiring diagram is the same as the wiring in your quad then the first thing I would do is check for power to the CDI. You should have 12 volts on a red/black wire while trying to start the quad. Several things have to be connected and working for the power to get to the CDI. The following things are wired one after the other in the order shown:
1) The fuse can't be blown
2) The ignition switch must be on. There are two switches ganged together on the igntion switch. One switches on fused twelve volts, the other switches a ground connection to the starter relay through the start button.
3) The handle bar run/stop switch must be in the on position.
4) The tether cord safety switch must be installed and the switch contacts closed.
The trigger timing pulse to the CDI comes from a winding on the stator. This signal tells the CDI when to fire the spark plug. It goes through the remote control module. Does your quad have the remote control module installed? If the trigger signal is making it all the way to the CDI it will appear on a white black wire at the CDI. You should see some small AC voltage on this line while cranking the starter motor (maybe 0.3 volts AC). You'll need a voltmeter to measure this - a test light is worthless. Harbor freight routinely puts their cheap voltmeters on sale for $3.00.
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