I currently have a 1993 kx500 with rad valves and fmf gnarly desert pipe with spark arrestor, i recently suffered an engine failure (which is actually a really good excuse to get it tuned!) so here is my shopping list tell me what you think of it:
complete engine rebuild at eric-gorr :
-resleeved cylinder
-big bore kit (88 cm of piston :O)
-stroker kit (if he has one)
-porting for mad mid and high rpm power
-pvl ignition(gotta get a ligth coil for that)
-all new bearings and likes
-piston plating,gearbox and bearings plated (ceramic composite)
-power everywhere porting
this is what 1500 $ will bring you at eg
(very good price)
then the really insane part comes in , i have a 9-40 hp nitrous kit from my cagiva mito that i want to try out,
i suppose cryogenic treatement(only 200 $) will help ,this is what I have in mind, got the cash, got the parts, just gotta get time to send them out, I estimate 100 hp w/o nitrous and 120 on laugh juice .
And because all of this will make the bike unusable in street conditions i have a spare engine that will be stock as the day it left japan.