Is the head destroyed?

can you post pictures of what you are describing?

Hey Bricko. go to http://justkdx.dirtrider.net/ click on KDX tech tips, then "top end pictoral" that's what it's supposed to look like. What you are describing has me confused. You sound like you're looking at a four stroke head. There are no exhaust valve holes in a KDX head. Only the water jacket.

Bricko, what year is your Bike? I have just done this process on my 1991. My Valves, like yours, were in an almost unrecognisable state. The holes in the head on my bike are a little worn out, but thats not a real prob cos there are little collars that go on top of the valves to hold them in place properly. Thr process described on the web page you have been directed to is for the more modern bikes. Put the bike back together, and take off the cap on the right hand side of the motor, this cap also has a rubber boot attached to it. under the cap you should see an arm with one nut holding it on to a shaft that goes down near your water pump. My shaft has "caution left hand thread" stamped across it (cos the nut is a left hand thread!!) OK, so assuming you can see all of this start the bike and rev it, at around 6000 rpm the arm shold swing out. If it doesnt, dont panic cos the shaft that goes into your cylinder is probably seized like mine was, but this in no real drama. I recommend pulling the cylinder off yourself, then buying the new bits and taking them to a bike mechanic to get them installed. My mechanic only charged me for half an hours work, cos he knows how to do it right the first time. Prior to that I tried to do it myself, and thought it was correct but was wrong. Its like a bizarre puzzle putting those valves back in! My bits cost me 250 bucks Australian for the lot except the main exhaust valve. But remember, this info is only good for the 89-93 model bikes.

Just some info incase you don't have a manual. I'm pretty sure theres suppose to be 2 pretty big round holes in the head above the valves. :nod:

http://home.cogeco.ca/~kellyjo/kips1.jpg
http://home.cogeco.ca/~kellyjo/kips2.jpg
http://home.cogeco.ca/~kellyjo/kips3.jpg

No Worries Bricko, Thanks also to John Cena. The scans he posted were very useful to me, I was going to post them here for ya but John beat me to it! While Ive got you, its worth poiting out that a) Most of the references to jetting in this site are of no use to us as us Aussie bikes have smaller carbs than the American/Canadian versions... our stock main jet is a 122 or 124, whilst the other bikes have a 155 as stock. and B) if you have seen the "stock pipe mod" instructions on the KDX homepage and are thinking of doin it, I strongly reccomend so. Its easy (if you know a good welder) and the results are well worth it.

Happy KDXing!