Electrics and Cylinder Kits

Hi, i was wondering has anyone ever had any ignition problems after fitting a barrel piston kit?

i have recently fitted a DR177 to my PX125e and i an getting no spark, i have replaced the spark plug, plug cap, HT cable and CDI/Coil yet i still have no spark. i have removed the stator plate and checked the OMHS and they are ok. i have taken the green wire out of the cdi to bypass the ignition switch but still no luck. 

 

Cheers J