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bevlak |
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bevlak Two Stroke Sniffer
Joined: 18 Jun 2018 Karma :
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Posted: 20:14 - 13 Sep 2018 Post subject: Please help! No spark on cg125, I'm so stuck!! |
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Hi all,
My second post here so thanks in advance for any help you can give!
Ok I've got a '94 cg125 I'm turning into a brat/tracker type thing
The bike was running fine and nearly ready for MOT, then one morning it won't start. Totally out of nowhere! No spark at all.
Bike spec:
Kickstart
Points ignition
12v
Things I've tried to no avail:
Checked earth to frame (it's fine and horn, flashers etc all work)
New fuse
Charged battery
Replaced ignition coil
Replaced generator/stator
Shouting
Swearing
Crying (don't tell my mates about that part)
Between each thing I've tried above, I've put the spark plug to the engine case and kicked it over. Nothing at all, no spark, no shock to my Fingers. This thing used to shock strong enough to make you drop the spark plug!
I'm totally out of ideas here guys, I'm sure there's some stupid thing I'm not checking or haven't plugged in?! Any help would be hugely appreciated, I'm so frustrated at the moment, and really don't want to shell out hundreds for electric work at the garage. I've done everything myself so far so would be a real blow to have to take it somewhere (blow to my pride that is)
Is there some other earth point I'm missing here? Is there one in the engine anywhere that might be bad? Can't find anything in Haynes about it.. help!
Again any ideas welcome!
Thanks!
Sam ____________________ Cg125 br-k '94 |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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jaffa90 |
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jaffa90 World Chat Champion
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WD Forte |
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WD Forte World Chat Champion
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Sister Sledge |
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Sister Sledge World Chat Champion
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bevlak |
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bevlak Two Stroke Sniffer
Joined: 18 Jun 2018 Karma :
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bevlak |
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bevlak Two Stroke Sniffer
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jaffa90 |
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jaffa90 World Chat Champion
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bevlak |
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bevlak Two Stroke Sniffer
Joined: 18 Jun 2018 Karma :
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Posted: 11:13 - 14 Sep 2018 Post subject: |
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jaffa90 wrote: | Earth check,meter set on 200 OHMS (usually at 6 0,clock) one lead on coil earth and the other on the battery /frame earth, (the reading should move from 1.
Coil feed check, meter set on 20v dc (usually 10 o,clock) Red lead into the coil input wire (NOT HT LEAD) and black lead on frame / battery earth, ignition on and kick over the engine, you should get a quick voltage reading.
Meter sockets, red lead into V/ohms/mA, black lead into COM. |
Thanks so much for this jaffa90, im gonna be dusting off the multimeter this weekend and checking all of this out!
Do you have an idea how i would test the voltage from generator? would i set multimeter to 20v dc and put red lead to black/white wire and black lead to battery earth? does that make sense?
thanks again ____________________ Cg125 br-k '94 |
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Suntan Sid |
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Suntan Sid World Chat Champion
Joined: 07 May 2009 Karma :
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Posted: 13:08 - 14 Sep 2018 Post subject: |
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Have you checked/gapped/cleaned the points?
Have you checked the ignition timing? ____________________ "Everybody needs money, that's why they call it money!" |
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bevlak |
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bevlak Two Stroke Sniffer
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Suntan Sid |
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Suntan Sid World Chat Champion
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Posted: 15:49 - 14 Sep 2018 Post subject: |
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If you type "cg125 no spark" into google, the first result is 5 threads from BCF, have you read all of these? ____________________ "Everybody needs money, that's why they call it money!" |
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bevlak |
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bevlak Two Stroke Sniffer
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jaffa90 |
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jaffa90 World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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jaffa90 |
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jaffa90 World Chat Champion
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
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bevlak |
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bevlak Two Stroke Sniffer
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Kawasaki Jimbo |
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bevlak |
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bevlak Two Stroke Sniffer
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Kawasaki Jimbo |
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jaffa90 |
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jaffa90 World Chat Champion
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WD Forte |
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WD Forte World Chat Champion
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Posted: 00:47 - 15 Sep 2018 Post subject: |
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Ignore my previous post, thas bollox
Just found this diagram and the black/white wire isn't a DC supply to the coil and points.
Power for the sparks is supplied by the flywheel generator to the points and coil
using a Black/White wire
Its further connection the ignition switch is to allow this power to be grounded
when switched off in order to stop the sparks/engine.
I'd open the the connectors near the coil and points and with a meter set to resistance test the switch opens then closes continuity to ground when operated
Then measure the coils LT resistance to ground which will be low, say 2 ohms or so
Then measure points resistance to ground as you slowly turn the motor
This should go very high when they're open and low as they close
Not too low though,
you'll be reading across the source coil so maybe getting say 100 ohms at a guess.
Probably all academic tho'
As the Op has been fuc.. err 'improving' it, my guess is the points mounting plate has come loose and been pushed away from the cam so the points are permanently shut.
Diagram what I did find, I assume it's the correct one for a BR-K?
https://3.bp.blogspot.com/-a5y9sagbCpI/VQl6R6oZG-I/AAAAAAAAKrg/zN0NfrvjAiw/s1600/002.jpg ____________________ bikers smell of wee |
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Old Thread Alert!
The last post was made 5 years, 250 days ago. Instead of replying here, would creating a new thread be more useful? |
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