Friday afternoon and I'm looking for things to keep me occupied until the bell rings. A combination of info from this thread and sizes checked with Parts Fish for 1996-current KDX200/220:
Rear wheel :
2 each 6004 (double sealed) bearings
2 each 25x42x5(stock) or 7(double lip see post above)
Front wheel :
2 each 6202 (double sealed) bearings
1 each 20x35x4.5(stock) or 7(double lip see post above)
1 each 50x72x7(stock and double lip)
I'm still running the origingal bearings on my 2003, and I have a spare set of bearings that I picked up from MSC for when my buddy walks up to my bike the morning before an enduro, wiggles the wheels and says, "You're bearings are shot, don't you ever check them?" I try to give them a yank at every washing, but ...
Considering pricing, seals and warranty, the lifetime bearings sound like a good deal, but for a cheap spare set for the tool box, here are the MSC numbers (bearing supply houses and other industrial warehouses will have the same stuff, but I like MSC or McMaster-Carr because it comes in UPS ground on the day after I order it):
2ea 35379494 6004-2RS rear bearing $6.02
2ea 36680114 25x42x7 rear seal $3.68
2ea 35379627 6202-2RS front bearing $4.33
1ea 36679439 20x35x7 front seal $2.95
1ea 50x62x7 front seal (I don't see that size in the catalog)
$15.72 total for rear
$11.61 total for front if you can live without the speedo side seal
<disclaimer>
Not responisible for typos, bad catalog numbers or just plain wrong information. May cause liver damage, kidney dammage, oily stools, blah, blah, blah ...