Predator Kill Switch

[chancer]

This is a frequently asked question.

How do I hook up a Predator kill switch?

In this Pic I show the Stock unmolested Wiring:
Notice the Yellow Wire going Down into the Block.


In this Pic I have unplugged the Yellow wire going Down into the Block.
This is the low oil sensor. You want it Disconnected or your engine will shut off during cornering.
(note) If you are removing you internal Governor you can also remove this low oil sensor in the block.


Now you just tape off the Yellow wire from the Block. The other end of the now disconnected Yellow wire is going in to the "Gold Box" Extend this wire to your Driver compartment ( I put mine right on the steering wheel) and add a switch. In this Pic I show a simple (non lighted) door bell momentary switch. Put your extended wire in one side and run a wire to ground from the other side of the switch.


On my Daughters Kart I have this button on the steering wheel within thumbs reach.


Here is the deal. The "Gold Box" is Magic.
Most engines require that you Ground them to kill the engine. So you have to hold down a button wired to ground continuously until the engine stops. Or wire a ground to a Switch.
Since the "Gold Box" is meant to sense a signal from the low oil switch it immediately Kills the engine with a momentary switch. This allows the use of a momentary button on the Predator. Great for safely killing the engine in an instant with the touch of a button.

You Do not have to use a "Doorbell button" In fact lately the non lighted ones are harder to find at the hardware store. Any Momentary switch (horn button) will work. Here is a nice all metal one I picked up at O'Reilly auto parts for 10 bucks. And a link to a $3.50 nonlighted button http://www.1800doorbell.com/gbase-dh1202.htm


Here is a simplified Complete version of the Wiring. On this Krate Racer I was able to use the factory wiring. You can see the "gold box" yellow going to one side of the button, and the other side of the button going to an engine bolt for ground.

[mckutzy]

Thats how I roll...... works great and no cutting/spicing...... and no toggle switch required either.

[Whitetrashrocker]

I also did the same by running that wire to a steering wheel switch.
I used a toggle that I had. No need for the magic box. Just remember to turn it on before you wear yourself out pulling the rope.

[mckutzy]

But the box is just that... leave all the electrics unmolested, just unplug and replace that wire as the sensor button...No need to remember to turn on/off the switch to start...
Press to stop/pull to start... simple... and no studdering to stop... just dead..

[chancer]

Here are a couple more pics. I like the buttons. They make a real clean install. and don't stick up like a switch. Also you can leave the red engine switch in the on position forever.

[chancer]

Unfortunately the 79cc Predator and Briggs Engines do not come with a "Gold Box". I had to use a switch. It can be annoying when the switch is left on or off, and in conjunction with the Motor on off switch. Yes you find yourself pulling the starter 10 times cause the switches are in the wrong position.

[pRoFiT]

Nice post. Good pictures. I still need to do that on my kart. Have only wires run no button. This week for sure.

[Functional Artist]

Originally Posted by chancer

This is a frequently asked question.

How do I hook up a Predator kill switch?

In this Pic I show the Stock unmolested Wiring:
Notice the Yellow Wire going Down into the Block.
Attachment 80034

In this Pic I have unplugged the Yellow wire going Down into the Block.
This is the low oil sensor. You want it Disconnected or your engine will shut off during cornering.
(note) If you are removing you internal Governor you can also remove this low oil sensor in the block.
Attachment 80035

Now you just tape off the Yellow wire from the Block. The other end of the now disconnected Yellow wire is going in to the "Gold Box" Extend this wire to your Driver compartment ( I put mine right on the steering wheel) and add a switch. In this Pic I show a simple (non lighted) door bell momentary switch. Put your extended wire in one side and run a wire to ground from the other side of the switch.
Attachment 80036

On my Daughters Kart I have this button on the steering wheel within thumbs reach.
Attachment 80037

Here is the deal. The "Gold Box" is Magic.
Most engines require that you Ground them to kill the engine. So you have to hold down a button wired to ground continuously until the engine stops. Or wire a ground to a Switch. Since the "Gold Box" is meant to sense a signal from the low oil switch it immediately Kills the engine with a momentary switch. This allows the use of a momentary button on the Predator. Great for safely killing the engine in an instant with the touch of a button.

You Do not have to use a "Doorbell button" In fact lately the non lighted ones are harder to find at the hardware store. Any Momentary switch (horn button) will work. Here is a nice all metal one I picked up at O'Reilly auto parts for 10 bucks.
Attachment 80038

Here is a simplified Complete version of the Wiring. On this Krate Racer I was able to use the factory wiring. You can see the "gold box" yellow going to one side of the button, and the other side of the button going to an engine bolt for ground.
Attachment 80042

Great Information!

...that almost every noobie & some oldbies can use

That's what i'm talkin' about!

[Rail rider]

Originally Posted by pRoFiT

Nice post. Good pictures. I still need to do that on my kart. Have only wires run no button. This week for sure.

1800doorbell.com it's a toll free website.

[OzFab]

Excellent thread, great detailed description

[chancer]

Originally Posted by OzFab

Excellent thread, great detailed description

Thanks after 3 years I finally figured out how to embed the Photos in the Text!

[landuse]

I have added this thread to the Helpful Links sticky. Thanks Chancer

http://www.diygokarts.com/vb/showthread.php?t=10036

[chancer]

Cool! I was hoping I could make it good enough to be a reference!
Thanks

[OzFab]

Indeed it is...

Now do one for an engine without a low oil sensor

JK

[pRoFiT]

Okay so i tried this doorbell method. The only single button doorbell home depot had on hand had a light in it!!! As chancer says in the beginning use a non lighted switch. Here is the reason. The light bulb in the lighted doorbells have about 130ohm worth of resistance going across the light. That is enough resistance to kill the engine all the time if connected.

To check if this is your problem after following this guide above, use a DMM and set to ohm's meassure the switch as is. it should read open and not 130 like mine did.

To fix it you can carefully remove the light from inside the doorbell button. (maybe you could even go crazy and put 110vac through button to blow out the light bulb??? dont try that at home)

Anyways, the button top comes of easily and you can get to the bulb and remove it. then replace button and you are good to go.

Using the DMM measure open and closed positions to make sure you didn't damage the button.

[Mr. Spindle]

I see the light.....*

[Rail rider]

Originally Posted by pRoFiT

Okay so i tried this doorbell method. The only single button doorbell home depot had on hand had a light in it!!! As chancer says in the beginning use a non lighted switch. Here is the reason. The light bulb in the lighted doorbells have about 130ohm worth of resistance going across the light. That is enough resistance to kill the engine all the time if connected.

To check if this is your problem after following this guide above, use a DMM and set to ohm's meassure the switch as is. it should read open and not 130 like mine did.

To fix it you can carefully remove the light from inside the doorbell button. (maybe you could even go crazy and put 110vac through button to blow out the light bulb??? dont try that at home)

Anyways, the button top comes of easily and you can get to the bulb and remove it. then replace button and you are good to go.

Using the DMM measure open and closed positions to make sure you didn't damage the button.

Now that it is apart, and you bypast the bulb hit it with some red plastic paint before reassembly.

[supermanotorious]

I myself do not like momentary switches for kill, I want to flip a switch and be done, not have to hold it until RPMs are too low to sustain spark

[chancer]

Originally Posted by supermanotorious

I myself do not like momentary switches for kill, I want to flip a switch and be done, not have to hold it until RPMs are too low to sustain spark

No No No... Read carefully. That is the point of using the Gold Box. It is an "instant kill". No holding down a Ground wire button waiting on the engine to stop Dieseling.

[Flyinhillbilly]

What's with the two wedding rings? You Kaliphornya guys are weird.