Hi,

First time poster, been lurking and learning for a while. I am new to ATC's but have been into CT70's for a while. I bought an 84 ATC70, had no spark. I want to get it running for my son's bday next month. I figured "this electrical system is dead simple, I can get it to spark". Well, after installing and setting brand new points, condenser, plug, plug wire and coil I still got nothin. I jumped the kill switch wires, wired them together. Still nothing. So I am stumped. I went step by step through everything (I think). It looks like only one black wire comes from the stator and leads to the coil, so I am running out of things to check. Anybody with more experience with these little beasties have an idea of where I can go next?

Take test light to that wire that comes from the stator then pull the starter and see if you get a spark.

Take test light to that wire that comes from the stator then pull the starter and see if you get a spark.

Yea, good spark there. Then as soon as i hook that wire to the longer wire leading to the coil - nothing. No spark anywhere. Does this mean there's a short somewhere?

me likey to learn

maybe a bad coil??

Thats what im thinking. I have bought new coils that were bad. .

I dunno. I think that coils almost never go bad and that would mean both the original coil was bad and then the brand new one too. I think that is possible but not very likely.

As soon as i hook the black wire from the stator to the long wire that goes to coil I get nothing - even back at the stator. I would think even if the coil was bad I would get spark back by the stator still? I'm not much of an electrical whiz, but I think if I jump the wires on the kill switch the circuit should be complete, isn't that correct?

This is frustrating and weird.

Your kill switch should be closed, jumped to ground when you want to kill the motor . Open the switch and give it a pull.

I have a box of bad coils, they do go out.

Your kill switch should be closed, jumped to ground when you want to kill the motor . Open the switch and give it a pull.

X2,

From your post: ....I jumped the kill switch wires, wired them together.

No sparky with the kill switch jumped or on.


Kill switch off = Open to ground
Kill Switch on = closed to ground

Dude! There's my spark. You guys were bang on... got spark. Now to reassemble and fire that 70cc beast up! Thanks much for all the help for a lowly newb!

Glad I could help ya out, I made that mistake with a kill switch/ tether switch and scratched my head when it wouldn't shut off .

I'm still a newb too and I went through the same scenario on my first 70. All of them non-runners, two didn't shift, complete messes. I'm on #3 now and #2 went without a hitch. She fired right up.

But I do have a list of things I do now to bring them back from the dead. Maybe I'll start a thread on that.