So I had the coil, wire, and resistor cap tested by a local shop-all good. I have a known good CDI box that the guy I got the bike from gave me. I plugged it in to another 400ex, and it ran fine, so I know its good. I am going to try and make some time this weekend to get my voltmeter and service manual out to do some circuit testing. Is there anything particular that anyone knows is a common problem on these that I should look at first? Any info will be helpful. thanks BTW, all electronics are stock. Only hop ups are bore kit, exhaust, and carb jetting.