You need to unplug the single black wire to your cdi box, This will eliminate all your on off switches, just remember if it does start you need to plug the wire back in to shut the machine off. Doing this will tell you if one of the switches is bad, the switches will then need to be checked individually. You can also check the grounds and make sure they are tight. Good Luck!
You just want to make sure you have checked everything else so you are not just throwing money at this machine to try to fix it. Then if your confident you have checked everything and eliminated any other possible problems then yes I would replace the cdi on the machine.
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