cylinder bore question

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novack2007
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Post by novack2007 »

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lets hope this works. its fubar.
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Julien D
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Post by Julien D »

Fixed the image tags for ya ;).

Yeah, thats a mess!
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Fletch
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Post by Fletch »

wow.
Ok I'll rummage through and see what I have
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Julien D
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Post by Julien D »

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...
novack2007
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Post by novack2007 »

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

Surely not. The pin is part of the subvalve, just dig it out of there. Unless you're talking about a different pin?
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novack2007
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Post by novack2007 »

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

ok just get it out. it's only a few mm long
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novack2007
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Post by novack2007 »

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.
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Post by dfeckel »

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!
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novack2007
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Post by novack2007 »

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?
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scheckaet
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Post by scheckaet »

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... :roll:
novack2007
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Post by novack2007 »

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?
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scheckaet
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Post by scheckaet »

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.
novack2007
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Post by novack2007 »

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.
novack2007
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Post by novack2007 »

dumb question can u put a kx 250 cylinder and piston on a kdx200?
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Julien D
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Post by Julien D »

No, you can not.
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novack2007
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Post by novack2007 »

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.
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Re: cylinder bore question

Post by loko_kdx200a »

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?
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