New member here with a Scrambler 400. I purchased a Scrambler 400 for my GF with a blown motor and replaced it with a rebuilt motor out of a Xplorer 400. Well since the wiring was different on the new motor I just used the CDI box out of the Xplorer on my Scrambler. Now my problem is that once the quad has been running for a while and the CDI box warms up the quad doesn’t want to shut off. I figured it is the CDI box because it makes a weird buzzing sound when i put my ear next to it. The quad doesn’t have a problem shutting off when it’s cold started just after it’s been running for several minutes. So far I’ve tried two different brand CDI boxes off eBay both new in the box and none of them start the quad. I then hook my old CDI box up and the quad starts right up. What’s the deal? Everything is hooked up just the same.