No spark!!

[msherry21]

Hi all, I have a 1984 Honda CB125RS (single cylinder) and I can't get a spark.

The bike was starting and idling perfectly before this issue, then when I went to kick start her, nothing, not a spark.

I've since replaced with a new coil, stator, spark plug and ignition but nothing.

I assume i'm supposed to have 12v coming from the stator wire going to the points and coil? I'm not getting that. I'm at a loss of where the problem can be, any ideas?

The battery has 12v. When I turn the ignition on, the neutral light lights up and the indicators and horn work.

Thanks for any help guys and gals. Cheers, Michael.

[jaffa90]

Have you checked the kill switch?
Have you checked for a spark with the plug cap removed using the h.t. lead?
With the ignition on and points closed do you get a spark when opening the points slightly?
I cannot find a wiring diagram for your 12volt bike.

[msherry21]

Hi Jaffa,

Theres no kill switch on this bike.

If there's no power to the coil, then I wouldn't get one at the ht lead.

No spark at the points, again, no power getting to them.
Thanks, Michael.

[jaffa90]

It`s an old one and yes you need voltage from that stator coil b/w when kick starting.

[msherry21]

If there's no voltage coming from the stator, what else could it be? I've changed the stator and still have no voltage there.

Thanks again, Michael.

[jaffa90]

A long shot,try and disconnect the other coil output to the lights and r/r and try again for an output using a multimeter.

[Fisty]

There will be a 36765453679 word spergathon in this thread.
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[jaffa90]

[Pete.]

[msherry21]

The battery has 12v...