I have no spark i did the follow test in the forums and at a loss now on what to try.

Method 1) Unplug the CDI and remove the kill switch pin in the CDI connector on the wiring harness. The pin is held in with a spring tab on the pin itself. You'll have to probe into the connector and push this tab in order to extract the pin. Plug the CDI back in (kill switch wire dangling) and see if you have spark. no spark

Method 2) Unplug the CDI. Turn on the ignition switch and set all kill switches to the run position. Use a meter to measure resistance in of the kill switch pin in the wiring harness connector to engine/frame ground. If the resistance is infinite on the 200K ohm scale then your kill switches/kill switch wiring are OK. If you measure zero ohms then you have a kill switch/wiring issue. Working as it should

The other inputs your CDI needs to make spark are AC Ignition Power, and the Trigger signal. Do the following:

1) Unplug the CDI. In the wiring connector measure the resistance of the AC Ignition Power pin to the Ground pin. You should see 400 ohms or so. What do you measure?360 ohms

2) Measure the resistance of the Timing/trigger pin to the ground pin. You should measure 150 ohms or so. What do you measure? 129 ohms

3) Leave the CDI unplugged. Set your meter to measure AC volts on the 100 volt scale. Measure the voltage on the AC Ignition Power pin to the ground pin while cranking the engine. You should see 40 to 80 volts AC while the engine is cranking. What do you measure? 41 volts

4) Set your meter to measure AC volts on the lowest scale you have. Ideally this would be 2 volts but many meters don't go down this low. In that case use the lowest scale you have. Measure the voltage on the Timing Trigger pin to the Ground pin while cranking the engine. You should 0.2 t0 0.4 volts AC. What do you measure? 1.2 volts

Now for measuring the output side of the CDI:

A) Leave the CDI unplugged. In the CDI wiring connector measure the resistance of the Ignition Coil pin to the ground pin. You should measure less than 1 ohm (but not zero ohms). What do you measure? .7 ohms

B) Plug the CDI back in. Set your meter to measure AC volts on the 20 volt scale. Set all kill switches to the run position. Crank the engine while measuring the voltage on the Igntition Coil pin to ground. Poke through the insulation of the wire if you can't probe the connector. .03 volts

I tired a cdi and coil off a 50cc but I am not 100% sure those parts are good. I never heard the 50 run.

 

I had no spark so I had my Grandaughter hold in the tether kill switch and I then had spark. I Wedged a piece of paper so the switch would be pushed in more and have had no more problem.

 

I tested the kill switch. It appears it is working correctly on the kill side.

 

Try replacing the Stator

 

That doesn't even make sense..

It seems it is just a switch problem.

If it was me I would just by pass the tether switch completely and ride the bike.
If you need the switch for a little kid or something then replace it.

 

Sorry his last two posts weren't showing up on my side when I posted this, leave it alone.

 

It was the stator ran for 5 mins then blew the headgasket.

 

So now we know..