They also said that the following will interchange:
1999 400, 454, 500
2000 400, 500
2001 400, 500
2002 400, 500
Although they didn't sell a whole lot of the quads, they said they have never sold a cdi unit for them (But that don't mean yours is or isn't bad), and before you buy to make sure all of your connections are good and clean, look for broken wires, and check your switches to make sure you don't have a short.
Like the sleds, there is probably a way you can "jump" the wiring harness to rule out if it's the switches and whatnot.. Done it a few times on snowmobiles to make sure that it is in fact the cdi/stator/coil before spending money on them. Their mechanic was busy when I called, so I did not get to ask him how I'd go about ruling out anything.
Hope this helps.. If you have any more questions, just drop a line
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