Is My CDI Ruined?

[Mercury]

I accidentally connected the CDI incorrectly. Black wire to blue. Blue wire to black. I tried starting my Grubee 66cc motorbike several times before I noticed my mistake. Is the CDI ruined?

 

[Longshot270]

Have you tried reversing the wires and starting it?

 

[Mercury]

Yes, wouldn't start.

 

[Longshot270]

I don't think it would have fried it but that is a possibility. I noticed you're in Austin. Did you leave it outside during all this rain by any chance?

 

[briggsandstratton]

i did the exact same thing after a few times of trying it with the wires on correctly it fired right up
-briggsandstratton

 

[Mercury]

It's been inside. But it got pretty wet a few weeks ago. Noticed some rust at the top of the case. It did run yesterday. Then I took it off to replace the stock wire with the SB plug wire. Hasn't started since then.

 

[Longshot270]

The reason I asked about the rain is because I'm just south in San Marcos and don't have any kind of cover for the bike besides a hackberry tree. We got some really good rain and when I tried cranking the bike a few hours ago I was having a no spark on a bike that normally runs like a beast. I started loosening the magneto cover screws and got water streaming out. Blew it out with the air compressor and followed with WD40 and it ran for a short while. Then started to act like more water under the cover.

Edit: check that the boot is making a good connection with the plug. Normally when the bike doesn't start, go to the latest changes.

 

[BigBlue]

Mercury,

It's a possibility you still don't have the electrical wired correctly. Disconnected the kill switch and don't hook it up till you've got it running.

Here's a doc from forum member AI.Fisherman that will help in no start situations:

https://docs.google.com/document/d/1aBeJuoS--VQWwXysc07rpscTUbPzgc93xjiQBgsyFjc/edit

Good Luck,

Chris
AKA: BigBlue

 

[maurtis]

Mercury, I would definitely try rechecking your connections to the CDI and the plug wire and plug first, then check for spark by grounding your plug and checking for spark. Hopefully it was just a loose connection!

Longshot, I was just in San Marcos an hour ago, over at San Marcos Bearing Supply looking for a replacement needle bearing for the wrist pin. They did not have any If I can ever get my bike back together and find a back road from Kyle to San Marcos, we should hook up for a ride!

 

[Mercury]

I believe my problem is due to a bad magneto. Per Al Fisherman's checklist, I measure resistance between blue and white wires. Measured 325 ohms, in line with 300-400 range. But the black and white wires had infinite reading. Same when I measured at the terminals within the magneto case. So large (black) coil must have a break in the wire?

Just ordered a new magneto from Dax. But then realized its a 6-hole magneto vs. my 4-hole magneto! Will it still fit and work?