spark plug wire info

[crassius]

older CDIs with the thin mounts unscrew easily - newer CDIs with the thick mounts need to have old wire dug out of the glue that holds them, after that they screw in/out easily

still don't know if there is a good way to suppress speedo interference without causing weird ign weaknesses

 

[Master-shake]

The CDI box has a screw in it? I'm gonna go check that out real quick. I know the boot has a little screw in it. I bought one of those NGK bp6hs plugs. It's bigger than the stock three plug one. It works well so far. Haven't messed with the stock gap of it yet.

 

[dodge dude94]

The wire screws onto a screw in the CDI box.

 

[Master-shake]

Mine must be one of those "newer cdi's" because it feels pretty stuck in there. I got one of those kits from gasbikes.net a grubee gt5 made in 2012.

 

[Jeckler]

It's glued in. You could try some nail polish remover or acetone to loosen the glue. Or just twist it out like I did and use a pick to get the left over pieces. Don't pull it out straight, you'll probably rip the screw out too.

 

[dodge dude94]

Mine was a turd to remove as well. I used channel locks and a random pulling motion to remove it.

 

[Huffydavidson]

I I disagree with you bikenut, I've been running a 6mm Mopor Hemi suppressor wire two year with NO magneto failer ever. Before I got the Jaguar and on it as well. !!!!

 

[Huffydavidson]

Here we go again. Do a search in norm's repair. Buyum books sendum to school...................................:..

 

[biknut]

I I disagree with you bikenut, I've been running a 6mm Mopor Hemi suppressor wire two year with NO magneto failer ever. Before I got the Jaguar and on it as well. !!!!

I agree that suppressor wires, and caps are not a main cause of magneto coil failure, they're only a supporting factor. Wide spark plug gap combined with high speed operation is a bigger factor.

 

[dodge dude94]

I don't see how a mag can fail. It's, for the most part, solid state. The only thing i can think of would be the magnate losing charge.

 

[biknut]

I don't see how a mag can fail. It's, for the most part, solid state. The only thing i can think of would be the magnate losing charge.

What's fragile is the magneto coil. The windings are very small gauge wire, and can't handle much current, or abuse. A good way to burn one up is, run a wide spark plug gap, use suppressor wires and cap, and run your motor at high rpm in hot ambient temperatures. The best way to avoid trouble is keep your plug gap small, like about 0.025".

The CDI box OTOH seems pretty dependable.

 

[dodge dude94]

What's fragile is the magneto coil. The windings are very small gauge wire, and can't handle much current, or abuse. A good way to burn one up is, run a wide spark plug gap, use suppressor wires and cap, and run your motor at high rpm in hot ambient temperatures. The best way to avoid trouble is keep your plug gap small, like about 0.025".

The CDI box OTOH seems pretty dependable.

And where are the windings located? I haven't done much research on it as I haven't had issue. That was it the coil wires are coming off of?

I think my gap is like .030 or something. lol

 

[wan37]

I have had my bike engine 3yrs now with that wire posted in #1 and no problems and a B6hs plug gaped at 28.No magneto problems at all it's been Through a lot .I have also been running a 3watt headlight off the white wire for 2yrs now. There was a time that I thought the magneto was going to go out but I'm still running it , got wet with a fuel mixture from leaky seal. So what ever works. I believe there no set and stone when these china parts and engines goes bad. It's a big crap shoot. I also got about 2k miles on it.

 

[crassius]

looking back in the threads several months ago there were LOTS of dead CDIs

 

[biknut]

And where are the windings located? I haven't done much research on it as I haven't had issue. That was it the coil wires are coming off of?

I think my gap is like .030 or something. lol

The magneto coil is under the left side engine cover.

 

[biknut]

looking back in the threads several months ago there were LOTS of dead CDIs

I replaced 3 CDI boxes myself.

Turned out later none of them were bad though lol.

 

[dodge dude94]

The magneto coil is under the left side engine cover.

So that's the little armed guy that the mag spins inside of, correct?

 

[biknut]

So that's the little armed guy that the mag spins inside of, correct?

Yeppers. You can tell how fragile it is just by looking at it.

 

[dodge dude94]

Yeppers. You can tell how fragile it is just by looking at it.

Gotcha. How do you fortify it? I like overkill. I know something about winding your own...

 

[biknut]

Gotcha. How do you fortify it? I like overkill. I know something about winding your own...

So far the best thing I know to save them is keep your spark plug gap around 0.025".

I used to run 0.035" gap. It wasn't ever a problem till I got 2 Flying Horse 80 kits that run 8000 plus rpm. In every case when a coil failed it was during a long ride at very high rpm. I was also running a suppressor plug cap at the time, but I can't really say if or how much that may have contributed to the failure. Lets just say it didn't help anything.

After closing the gap to 0.025" I haven't lost a mag coil since, and I don't feel there was any decrease in performance either.