Age. Damaged. dirty
A bad cdi, will cause no spark if its completely bad, but if its going bad can cause misfires, random stalling and rough running, like alot of backfiring and stuff.
take the cdi box off and try cranking the scooter youll notice that it still sounds like the coil is bad then wait till night time plug the cdi back up then watch the coil if it throws a spark its not your cdi it might be your spark plug but if you see no spark then its most likley your cdi box or coil thats teh best way to know if your scooter is cdi enabled or needs a coil theres a big defrence when it comes to price of these devices though.
bolt headlight off and u see the cdi box
Normally, they don't start to go bad. They either die outright or have moments where they'll just work or not but doesn't last long that way. But be sure to test the output of the pulse coil and the kill switch before condemning the CDI box.
tap on it with something then try starting it if it starts its the cdi box
buy a manual and fix it. its easy, not rocket science
Sorry you can't rebuild a CDI box, as a matter of fact you really can't even diagnose it as bad (usually, a few rare bikes have the ability to be tested), you just have to rule out everything else first. Considering Just how much a CDI box costs you DEFINITELY want to confirm that everything else is ok first. The only other way to check the CDI is if you have a friend with THE EXACT SAME BIKE! Try and talk them in to swaping with you, just to see if it'll run. However if there is something on your bike causing the CDI to go bad, be prepared to buy both of you a new CDI. Good Luck.
Yes, they are exactly the same.
Check ur spark plug and if none of them are firing the its ur cdi box
No.
the cdi box is what give you the power to create that spark. yes it will