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lets hope this works. its fubar.

Fixed the image tags for ya ;).

Yeah, thats a mess!

wow.
Ok I'll rummage through and see what I have

The rod looks usable. I know for sure I have no spare subvalves. My bike used to eat them up. How is the main valve?

I assume you've seen the "Bigfoot CAPTURED" thread? I feel sure that plate is an improvement. Also, where the little pin on the bottom of the subvalve rides in the cylinder, you can tighten that up a bit if there's too much slop. Those things along with new valves and collars and proper lube they should last you a long time. Hopefully...

well there might b a problem. the little pin in the bottom of the cylinder snapped off. so i guess now im really screwed?

Surely not. The pin is part of the subvalve, just dig it out of there. Unless you're talking about a different pin?

if u are looking at the front of the cylinder at the exhaust port. its the one on the right.

ok just get it out. it's only a few mm long

ok got the pin out yesterday. for the hell of it i ball honed the cylinder and i got some cross hatch in the cylinder. its going to be a trail bike and maybe hit the trail twice a month. i might get a piston and rings and give it a try. i trued up the head and i just need too tru up the top of te cylinder too. whats the worse that could go wrong have too pull it apart again and get new rings and replate the cylinder.

Hopefully the ball hone didn't remove the existing plating. If it did, I cannot imagine the new piston and rings working for very long. And let us know what the power delivery is like with no power valves . I suspect a weak bottom end with a hard hitting upper mid range!

no it didnt remove any of the coating i did do it lightly and used alot of wd-40. is it going to harm anything not running the power vlave systen=m?

Pics would be good to assess how bad your cylinder really is.
Yeah what's the worst that could happen if your piston and ring go kaboom, aside from a destroyed cylinder, + piston , + new rod, and new bottom end...

well i think im just going to send it off to a place 1/2 hr away from me and get it replated. powerseal usa said it would be 170 to strip replate and hone. any down side to not running a power valve besides being doggy on low end take off power?

I used powerseal on my last replate and was happy with the results.
Only downside on running without the valve is you'll have about 0 low end.

well 2 ride the bike through the woods and fields not many steep climbs maybe i wont worry 2much about it. its just 2 beat around on and have some fun.

dumb question can u put a kx 250 cylinder and piston on a kdx200?

No, you can not.

crap found a good deal with a cylinder head and piston. i forgot 2 say the kx is a 92. the pics looks like the same cylinder.

I have an 84 kdx 200 and upon splitting my case I found rusty main bearings. Looking to do a rebuild can't find anything for piston kit . I believe my cylinder is plated as I do not see a seem for a sleeve. any ideas?