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Ok so i have tested all wiring from cdi. There is no power feed from the stator only the pickup wire as my bike is DC. There is a 12v feed going into the cdi from the back of the ignition switch. Pickup wire from stator is fine. Coil is fine as tested it on another bike. But what i have found is that there is a voltage of 14.5 to the black/yellow wire on the back of the coil with the ignition switched on but it drops to zero as soon as the green wire is attached to the coil. I have checked on another bike that runs and there is no voltage showing at the back of the coil until it is running. Also the 14.5 volts spikes to around 15.5 just as the ignition is switched off and then the voltage SLOWLY drops to zero. When holding a spark plug to the engine it does occasionally produce a spark but it is very weak.

Any ideas please?

My scooter decided to stop working last week. It was fine on monday then tuesday wouldnt start. Turned out there was no spark. Replaced the battery as it kept going flat about a week before. Ive now put a new coil and cdi in but still wont start. Stator tests ok with multimeter as does the coil. The new cdi makes a high pitched humming noise as soon as the key is turned to on. The old one makes a fast clicking noise. Is the normal and what else can i try. Also when testing the two leads from the cdi to the back of the coil they are reading about 6 volts just with the ignition on is this right? I would have expected them to read zero unless cranking the engine over.

Thanks