i have a chinese atv that was given to me it wont spark i think its the cdi but want to make sure thats it befor ordering neather leg of the coil has power if someone can help thinks its so cheap they didnt even give it a name its a 50cc scooter engine on a atv its a 5 wire cdi

 

Most no spark problems have to do with kill switch issues. Turn on the ignition, turn off all kill switches (handlebar, and tether if equipped). Disconnect the CDI and measure the kill switch pin in the wiring harness to ground. It should be infinite ohms. If it is shorted to ground you have kill switch problems.

Lets start here. If you have kill switch issues then we go that way. If you don't then the next step is to measure stator output voltages.

 

i have disconnected the kill switchs i do believe the are the black and white wireit has two that come from the engine black and red which will give you a good jolt and blue and white i think chargin system and and the are two on a pig tail orange and black not sure where the go on the cdi

 

You really need to use a meter to measure the resistance of the kill switch pin (black/wht wire) to ground with the ignition on and the kill switches off. The idea is to either identify or eliminate kill switch problems then move on from there in the whatever direction that takes us.

You could also eliminate kill switch problems by popping out the kill switch wire from the CDI connector and then plugging the CDI back in. If the quad starts then you definately have kill switch problems. If it doesn't start then you really don't know. You could still have kill switch problems, and another problem at the same time that keeps the quad from starting. By using a meter you can look just at the kill switch wiring and nothing else.

If you pop out the kill switch wire and the quad does start you have another problem - you won't be able to turn the quad off without reconnecting the kill switch wire. And there is high voltage on this pin so you can't just plug it back in with your fingers.

Let's say you don't have kill switch problems. Then the next step is to use a meter to measure the stator voltages to the CDI. Meters are cheap these days. A really good one is about $20. If you shop around you can get them cheaper than this. You're going to need a meter. Can you borrow one maybe?

You said you didn't have power on either leg of the coil. If by "power" you mean 12 volts, you are not supposed to have 12 volts here. It is AC (not DC), it is intermittent pulses, and fairly high voltage.

The blue white is likely the trigger signal that tells the CDI when to fire.

The battery charge wires from the stator go to the voltage regulator. They have nothing to do with spark and can be ignored for this particular problem. Later when your quad is running, if you find your battery isn't charging then we can tackle that as a separate problem.