parts that will interchange with '86 KDX200...
seat foam, seat cover
KX125 84/85/86/87*
KX250 84/85/86/87*
KX500 84/85/86/87*
carb manifold
KDX200 86-88
KX125 85 (maybe 84)
KX250 85/86 (maybe 84)
KX500 85/86 (maybe 84)
side panels
KDX200 86-88*
piston kits
KDX200 86-07*
forks, triple clamps, steering bearings
KX125/250/500 85-88*
KDX200 86-07*
(basically the the KDX's stuck with 43mm forks from 86 on. The lower leg changed in 95 when they went to a wider diameter axle and different brake mounting. The complete fork from any year would slot straight in to your clamps. KX's used a 43mm fork up until 88, which would also slot straight in. The triples from any year KDX or KX up to 94 would also fit onto your frame.)
rear shock
KX125 84-85
KX250 84/85
KX500 84/85
front and rear wheel bearings
KDX200 86-94*
KX125/250/500 86-87
splined kickstart boss
KDX 86-07*
rear MX fender
KX125/250/500 85
Front fender
KDX200 86-94
KX125/250 84 (maybe earlier) to 89
KX500 84 (maybe earlier) to present day
front wheel
KX125/250/500 84-88 (would need to customize spacers)*
rear wheel
KX125 85
KX250/500 85-86
This is a list based on stuff I know for sure* and confident guess work. I've been doing an '87 KDX based project so have spent far too long working this stuff out on Ebay and on the parts diagrams on
www.kawasaki.com (go to owner's info on the left hand side to find parts diagrams so that you can match up parts numbers)
potential upgrade combos...
84 KX500 tank (not vital, just a neat looking tank)
KX125 USD forks and triple clamps 91/92/93/94
swingarm/rear disc/wheel set-up from KX250/500 1986
hard seat foam from Guts racing KX500 85-87
This stuff should just bolt on to your bike, but check the visuals and measurement first (ie keep the receipts!) These mods would make a big difference to the ride. All at bargain prices if you spend enough time on ebay...
Like Dirt bike Dave says, everything on 86-88 KDX200 is interchangeable.
Hope this helps.