Ive checked the plug wire and grounds they seem fine , and the coils grounded good and the cdi box looks good inside
Had similar problem with a 125cc scooter I worked on. First crank of the engine showed spark on first compression and wouldn't spark anymore until you would wait 10-15 minutes. Then it would give only one spark again.
Found it to be a faulty CDI box.
You can't test or repair a CDI box, only replace it. Electrical parts that are purchased, cannot be returned so, you need to be sure it's not the pickup coil, pulse coil,secondary coil, plug wire, plug cap and spark plug itself before you purchase a box. By checking the specific resistances with a ohm meter on the previous mentioned components, will help determine if it's the box or not. Hope this helps!
SOURCE: Help !
hi m8,, usually if the cdi is playing up u wont have a spark at all,, has the carb been cleaned out, ,,id look at the 1st,, ,clean the jet out ,,and any brown residue,, pull off the plug cap from the spark plug,, ,, then unscrew the cap and just snip a little bit of the ht wire off,, so u see a copper lookin bit of wire pokin out the middle of the black ht wire,, then screw the cap back on,, try this 1st m8,,
SOURCE: will a two cdi box system work on a wire harness
No it will not work.
Testimonial: "Quick answer. Wish i knew why they won't work though, same year bikes and make other than mine is a vt500c the other is a vt500 both 1985."
SOURCE: not recieving ground at my fuel injector.code 39
Wire a permanent ground to bike or if this leaves pump on always then install a switch inline.
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