Real Stumper......

Joined
Jul 15, 2007
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#1
hey ive got a 84 cr125 and i can no longer get it started. When i first got it i had it resleeved, new top and bottom end, new bearings and seals all way around and it has about 15-20 hours on it. I run it 32:1 with motul.

so my problem is this, 2 months ago i wasnt getting any spark at all, ruled it out to be a faulty stator cuz my manual specified for a 98 ohm reading and i was getting over 200 ohms. everything else(CDI, Ignition coil) have been replaced with good working units. So i ordered a new stator from rickystator.com and it came in last thursday and i put everything back together. The spark looked really big and blue and friday night i finished everything and stated it in about 3 kicks. I went for an hour ride came back parked the bike and went to it the next day and it wouldnt start. I baught new spark plugs still wont start. Checked to see if it was flooded by turning the bike upside down and it was fine. So really im just looking for ideas on why it wont start now when it did a cupple of days ago. Ive checked the wiring and it all looks good, i checked reading of the coils and there also good. Im going to replace my CDI with another one tommorow cuz right now im sick of taking everything off.

Throw me a line if you have any suggestions, i really want to ride ive been without a bike for 2 months now and its killing me.
 
Joined
Jul 8, 2006
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#2
Have you eliminated the kill switch? I have seen kill switches get shorted out. Sometimes you got fire sometimes you don’t.
 
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#3
ya ive completely disconnected it. As well i forgot to mention, i am currently getting a spark but its not that big, do you have to adjust the timing when you replace your stator?
 
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#4
You didn’t mention anything about the pulser but I don’t know if that would make a weak spark though. I had one go bad and the bike would run about 20min start missing and go dead and wouldn’t start back until it cooled. Have you changed to a different plug cap or did you take the plug cap off the old coil they can cause problems. Electrical problems can be a pain to diagnose.
 
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#5
ya ive switch many plug caps and ignition coils. the pulser reads within specifications as well.

keep em comming im open for more ideas.
 
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Jul 18, 2007
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#9
Yes you may have to time your bike. possibly your flywheel lost magnetism? I dont know? Just check all your electrical things, thats an old bike. Exciter coil? pulse generator? coil? whatever? If it's getting spark then check your time. If it's weak spark, check your cap, and wire, stuff mentioned above ^^. Good luck bro. Hard to tell over the internet.
 

BSWIFT

Sponsoring Member<BR>Club Moderator
N. Texas SP
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#10
Have you checked your reeds? Air filter? Case seals? Ground wire? I work with electronic systems daily and meter readings help with most everything I do. However, sometimes it just takes trial and error or pure dumb luck to find the problem. You have centered all of your questions on the electrical parts but there is more to your engine than electrical components. Fuel, air, compression, and spark. Any one of these things could cause your engine not to start.
I'm not trying to downplay or criticize just reminding you there are more things to look at.
Next time you post I'll try to reply within seconds.;)J/king
 
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#11
As long as your stator plate is lined up,your key is not sheared and you are trying a new plug after it dies,then I would check the plug for jetting or mechanical issues.
 
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#12
its just really bugging me, i dont know what it is. Since i got the bike it had always had a weak spark and now that i had my new stator put on it had a big spark for one day. Ive replaced everything except the flywheel and the pulse generator with good working units, ive made sure all grounds are good. I have a buddy with the same bike and he got the same stator as me and he didnt have to time his bike. I checked my reeds and there firmly pressed against the reed cage with no cracks or missing pieces, ive got just about 180PSI of compression my air filter is a bit dirty but no enough to stop the bike from working properly(the air filter has about 1.5 hours of time since it was last cleaned)

Its just really getting to me cuz usually i know what the problem of something is when i hear a story or someone comes to me with advice but this.... this i have no idea! Does anyone know where i can get a new flywheel? that might be my cause but im sure as hell not paying Hondas price, if it is still availble.

What about pulse generators.... anyone know of a retailer that sells new or used pulse generators???

Thanks for the help, appreciate it.
 
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#14
the top end is only a few hours old, probably like 10. its a rough guess but im anal about top ends. the plug is wet and by dark i dont know what u mean. its not oil fouled dark. Ive tried new spark plugs, 4 new ones to make sure i wasnt getting faulty ones.