I want to shutdown 2 stroke engine with esp32. It is like remote kill switch for the engine. This means that I need to switch signal coming from engine stator to ground. That signal/pulses can be several hundreds of volts (about 500V or something like that) depending engine rpms. If we simplify and add little reserve the question will be: how I switch 1000V signal to ground using esp32 gpio? Can you help with schematics or can you give me a pointer where I can find example schemas 
I tried to google but I didn't find any good example. One important addition more, I want to do that switch very fast so switch can act as somekind of rev limiter also. For example every 20ms we connect stator to ground for a short time, maybe couple of microseconds or something like that.
leave it to professionals
1000v relay?
No relay, must be fet.
And note that even voltages are high this can't kill you. Many of us (I'am at least) have got electric shock from moped when tried to examine if spark plug is broken or not. Or many of us (I'm) have got voltage shock from electric fence, several thousands of volts.
You might be able to use a thyristor for a kill switch type application (say BT151) maybe with an opto coupler in the trigger circuit.
Also see here for stacks of such circuits: motelek.net - Die Motorradelektrik-Datenbank (Absteller = kill switch)
You mean powered.
The ESP also must be powered, so why not a relay.
Keeping ignition and processor electrically separated seems wise.
Did the same once for cart racing (paid laps).
The operator could remotely force the user to end the race (rev limiter).
Leo..
Yes IGBT. Smaller, maybe ten times cheaper than semiconductor relay.
Hmm...I don't know if relay could be good? I have thought that igbt is the best option to do this.
Edit: I read again and I didn't get what you meant by "The ESP also must be powered"? Of course it has to be powered 
Edit2: Sorry NOT IGBT (I was just reading about IGBT) I meant to write power mosfet, not IGBT. Anyway IGBT is maybe also good choice?
Your diagram may bit too basic if you are also talking about engine speed limiting. You will probably also have a pulse input into that CDI unit to trigger the spark. I guess it is there you would try to knock out unwanted triggers.
How does the current KILL switch work? Did you remove the original switch?
Whether it's lethal consists of several factors. Voltage, amperage, duration, organs electrified, etc. 1000 volts definitely has the potential to kill you.
True. But in this case I'm just switching to ground wire/voltages from small 2 stroke engine and the same voltages are available on the kill-switch connector and anyone can touch it. If it kills you, there should be thousands and thousands dead people around the world which are found around their motocross bikes or atvs. If you have ever repaired your moped you have got electric shock from spark/spark cable etc. It hurts but it doesn't kill you. And that 1000V is little oversized, real voltages are maybe 4-500V or less. Maybe 200-300V is near the truth but I'm just trying to find out how I can switch high voltages with esp32. If I find schematics for 1000V switching I'm absolutely sure that it will work with my case and there is enough safety margin.
No I don't remove it. Original switch will work normally.
I said potential. No need for drama or bad advice.
Pickup pulse "mute" would be better but it is not allowed to do
Yes. Sorry, english is not my native language. I can easily miss some words or points
For me is the issue of a fault killing the engine and then you by switching the engine off at an unexpected time .
I’m unsure of the voltages you mention what is the actual circuit diagram, I’m guessing it’s not switched off with those voltages ???
Good point but this is racing engine and it can shut down any time anyway and it doesn't hurt anyone. Kill switch voltage is really that high.
I said at first post "like remote kill switch" but in real life it won't be used literally "remote kill switch". It is just esp32 controlled kill switch which get inputs from somewhere and "turns kill-switch to ground" sometime
But that's not the point in this discussion. The point is if anybody can help me to get schematic for switching high voltages to ground with esp32 gpio port.
How does it kill? Normally such a switch would open a ground connection so no primary current can flow.
I was thinking more that you switch the power to the ignition module rather than switching the coil driver output, thereby making use of its drivers
worth googling such projects ( eg rev limiter)