No spark!

Anything else ya ride!
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Msherry21
Posts: 203
Joined: Sun Apr 27, 2014 10:18 am
Rides:: Honda C70 12 volt.
Location: Glasgow
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No spark!

Post by Msherry21 » Sat Mar 25, 2017 11:02 am

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.

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wightegi
Posts: 9710
Joined: Tue Sep 01, 2009 7:23 pm
Rides:: 12v 1988 e start C90,Royal Enfield Interceptor 650
Location: Isle of Wight

Re: No spark!

Post by wightegi » Sat Mar 25, 2017 1:57 pm

Is the woodruf key on the crankshaft in good condition ,if it is poor it can throw the timing out.

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Msherry21
Posts: 203
Joined: Sun Apr 27, 2014 10:18 am
Rides:: Honda C70 12 volt.
Location: Glasgow
Contact:

Re: No spark!

Post by Msherry21 » Sat Mar 25, 2017 3:05 pm

Hi, I'll have a check but surely that wouldn't affect the stator not having 12v? Which means the points are getting 12v when needed.

loadedtoad
Posts: 888
Joined: Fri Mar 04, 2016 11:01 pm
Rides:: C90 CBR600 PE175
Location: Derbyshire-Leicestershire Border

Re: No spark!

Post by loadedtoad » Sun Mar 26, 2017 5:51 pm

The ignition current comes from the generator directly on theses bikes if i remember correctly not from the battery.Like the early points setup on a C50/C70 CG125 flat battery no problem starting.
I would change the points and condenser as the next step,i think this was last version before the 125s went over to CDI.

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