Will purr along then all of a sudden be like I retarded spark 20° ! I have 2 cdis and does it with both ! I added some HEET to fuel cause it kind of acts like water in gas ! Ran fine before , then one day quit ! I replaced ign coil , cdi and Even though the pulse and charge coils ohm’d ok it started when I replaced the stator and trigger ! I mean the engine started when I replaced the stator ! Have a video but not sure if/how I can post it ?