It's easy enough to do just a little fiddly. Cdi sits under the frame behind the headstock, remove tank and you can see and feel it. It's held onto a bracket with a Velcro elasticated strap. I remove that first and gently pull cdi backwards, remove from plug and replace. Note any moisture or rust on the pins in the cdi. Mine has been clean and dry both times to be fair but still I don't take the jet wash any where near it.