1984 px125 no spark

[gino01]

Hi all bit of a strange problem,my px starts no problem,ticks over fine and runs fine.however after say 10 mins it dies.when this happens there is no spark but lights come on when kicked over so i,m guessing the stator is fine? After say 30 mins it starts and goes through the cycle again. Cdi is new,blue one yellow wire is off as if I connect it it won,t start?stator been rewired due to fraying
out of ideas now
thankyou

[shaunbond]

Its demonstrating all the signs of the LT coil on the stator breaking down when hot. They'll run until they reach a certain temperature then stop until cooled enough again... repeat cycle

[gino01]

Thanks for that,knew it was from that end but wasn't, sure if stators caused that,now I do. Will replace and hopefully break the cycle
Thanks again

[henri]

could also be the pick up failing in the same manner .H

[gino01]

Ok thanks I,m going to change the whole stator as it,s been on long enough
I shall report back when it,s changed

[gino01]

Ok put a new stator,cdi,plug in today and yes started straight away..............then died no spark again
At a loss now?

[mijapxman]

gino01, try removing the the outside green wire from the cdi and see if it runs.This will let you know if you have Short at the ignition.( If you try this, the ignition switch will not work if the engine starts, to stop the engine you will either need to remove the spark plug cap or stall the engine by putting it in  gear and gently letting the clutch lever out , while standing on the back brake pedal.)

If that didn't get the engine running, try borrowing a known working cdi and see if it runs with that fitted as faulty from new cdi's are not unknown.

Good luck.
Mij