Sounds like your Ignition Switch is causing the issues, If the contacts inside the switch are not being made when you turn the switch on the CDI will not recieve power and No Start will be the result
When you turn the Ignition on do you hear the Fuel pump priming ?
Have you got a Service Manual to check the Wiring for the CDI 12v Feed/s from the Ignition Switch when it's on...?
Oh and can you list them Mods as there may be an indicator there somewhere
