Topic: Can I use 650 coils on a 550?

[mono]

Yes, no?   Pretty sure I've got a dead/dying coil on the 550.

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[ckreb]

Depends on the vintage of both bikes. Grab a multi-meter and check the ohms. If they're the same you're golden.

[Tews19]

I have a nice set for sale. Pm if you are interested

[mono]

Thanks ckreb, I'll do that.   Just the resistance is important?

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[Bootlegger56]

If my feeble mind serves me correctly the 650 coils are @ 2.2~2.4 ohms.  I think I had this conversation with Hondaman when I got my last transistorized ignition system from him.  If I remember correctly he commented that with the limited power resources available from the 550 charging system that the 650 coils put too much of a load on the system even with his resistor pack installed.  Again I am working from memory and maybe someone else can verify this.

[ckreb]

Duh wasn't thinking. 650 came with EI. And put out around 10k more volts. So no they will not sorry.

[Deltarider]

The CB650 has a CDI ignition, so no.

[dave500]

its not an actual cdi type ignition but thats a common name for any of the factory electronic types.

[mono]

OK thanks guys!  it was worth a shot, as i have a 650 with no keys just laying around my garage lol.  well, it's on the kickstand, but you get it.

[mono]

Good news- found the problem isn't in the coil.  The female bullet connector for the ground wire on my 2-3 coil is broken!  Didn't even notice till probably the 3rd time I looked at it.  The female connector was cracked and kind of "hinging", so it was getting a good connection some of the time.   Cheap fix, but I don't have any connectors on hand

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[Bootlegger56]

That sure beats having to get a replacement set of coils or coil.  I usually don't get that lucky and by the time I find my power issues they have that "electrical death smell" if you know what I mean.