Gy6 no spark
- Thread starter Jdbuggy
- Start date
Karttekk
Well-known member
Make sure any stop switches are working. Usually there is one at the dash and one near the engine.
Pripyat
SCEE
The kill switch wire (white/black usually) has to be grounded to kill the spark. If you left this wire hanging or snipped it, the engine would fire and run. If the kill switch wire is connected to the engine ground, the CDI would not spark and the engine would not run.
[edit] There is voltage on this wire when the engine is running. Enough to give you a good zap.
[edit2] If you are new to karting and plan on having these engines around I would suggest ordering at least one spare CDI, voltage regulator, and coil. I've had all three fail at some point. Swapping a new one in (After verifying wiring so you don't burn up your spare as well!) makes troubleshooting a lot easier.
[edit] There is voltage on this wire when the engine is running. Enough to give you a good zap.
[edit2] If you are new to karting and plan on having these engines around I would suggest ordering at least one spare CDI, voltage regulator, and coil. I've had all three fail at some point. Swapping a new one in (After verifying wiring so you don't burn up your spare as well!) makes troubleshooting a lot easier.
Karttekk
Well-known member
Reconnect the switch wires on both if equipped. Why did you disconnect/unplug the switch?
I have a tester similar to this one. Connect the coil wire (what the GY6 plug wire is called) to it and clamp it on a good clean metal area of the kart. If the kill switch isn't working right you'll get one spark when you turn the key on then none as you crank it. Otherwise it will continually spark as you crank the engine indicating good functionality. As indicated from Pripyat, having spare ignition parts as test parts is a good idea. I would add having spare stop switches on hand too since they can be finicky.
I have a tester similar to this one. Connect the coil wire (what the GY6 plug wire is called) to it and clamp it on a good clean metal area of the kart. If the kill switch isn't working right you'll get one spark when you turn the key on then none as you crank it. Otherwise it will continually spark as you crank the engine indicating good functionality. As indicated from Pripyat, having spare ignition parts as test parts is a good idea. I would add having spare stop switches on hand too since they can be finicky.
Pripyat
SCEE
What?!?!?! Mind blown.
I am going to have to test this. I'm assuming this would depend on how the machine is wired.
I haven't heard of this....but that doesn't make it not true
Pripyat
SCEE
From my understanding it wouldn't be possible on an AC CDI but may be possible on a DC CDI. An AC CDI requires the engine flywheel to be rotating to charge a capacitor which is then discharged into the coil when the CDI receives the trigger signal. A DC CDI uses the battery instead of a dedicated charging coil so a spark technically could occur without the engine spinning.
If I had to guess, I would say that there are some DC CDIs that waste a spark when the unit first receives voltage from the battery (from the keyswitch) but I can't imagine that all units would do this.
If I had to guess, I would say that there are some DC CDIs that waste a spark when the unit first receives voltage from the battery (from the keyswitch) but I can't imagine that all units would do this.
Karttekk
Well-known member
That's exactly how the last GY6 engine I repaired behaved. It would crank but not start. If I grounded my test plug then turned the key on it would spark one time then nothing when I cranked it. I switched the wires on the kill switch in the dash and it fired up. At least on that kart the wires had to be opposite on each kill switch. Center lug had a blue wire with a white stripe and the end lug had a green wire, the other switch was opposite.
Attachments
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Kill_switch_wires.jpg
Karttekk
Well-known member
Follow the troubleshooting steps in this scooter guide, same principals apply to your situation.
https://absolutelyscooters.net/pdf/CGen_GY6_50cc_Service_Manual.pdf
https://absolutelyscooters.net/pdf/CGen_GY6_50cc_Service_Manual.pdf
Karttekk
Well-known member
Go through this tutorial
https://www.buggydepot.com/tech-center/gy6-150cc-ignition-troubleshooting-guide-no-spark/
---------- Post added at 09:54 AM ---------- Previous post was at 09:53 AM ----------
Or this one
https://atvconnection.com/forums/chinese-quads/374876-no-power-out-cdi.html
https://www.buggydepot.com/tech-center/gy6-150cc-ignition-troubleshooting-guide-no-spark/
---------- Post added at 09:54 AM ---------- Previous post was at 09:53 AM ----------
Or this one
https://atvconnection.com/forums/chinese-quads/374876-no-power-out-cdi.html
Nice!!!