cylinder bore question

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SCREAM
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Post by SCREAM »

I'll probably go with Langcourt since I've always heard good things about them.
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fuzzy
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Post by fuzzy »

Good choice. It's $180, and well worth that extra over what's likely at least $100 to sleeve it. Don't score it, and it will last MANY pistons, which on the KDX is generally thousands and thousands of miles.
'91 KDX 200 Project $300 KDX
'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
SCREAM
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Post by SCREAM »

What do you mean by "Don't score it"?
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Julien D
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Post by Julien D »

Don't leave a top end in there so long that it goes to hell and trashes the bore ;).
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SCREAM
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Post by SCREAM »

Ah, understood.
novack2007
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Post by novack2007 »

well compression on mine is 100psi. so off come the jug and take a look. found a place 25 min drive for me can do it for 200 bucks to replate the cylinder.
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Post by Fletch »

make sure they size it to whatever piston you buy for it. That 's important. Also make sure they deburr the ports, CV-tech did a really good job of this and it's important so you don't snag a ring. I would recommend a wiseco although your bike will have to be warmed up before you go belting on it. Not a bad practice no matter what you put in.
Also the cylinder should have no pin holes in the plating when you get it back. If they say it's for holding oil call bs on that one and have them re-do it.
Good Luck
Fletch
89 kdx 200 with 99 rm125 forks
novack2007
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Post by novack2007 »

ok next question. can some one point me in the direction on how much can i shave off the head to raise the compression and still run pump 93 gas without running race fuel?
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Post by gregp »

I would leave that to an experienced tuner. Shaving a head can involve very critical work. Just send it to Ron Black for his head mod. For the same money, you may have a hard time finding someone to simply shave the head.
JMO.
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fuzzy
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Post by fuzzy »

You don't really shave the head on a 2-cycle like you may do a little on a 4-stroke. It's all in the squish band area of the head, and is profiled in on a lathe. RB has the pump gas to the max profile all figured out.
'91 KDX 200 Project $300 KDX
'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
novack2007
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Post by novack2007 »

can anyone give me some more info on this guy? maybe ill just clamp the head and take a file and true up the surface again. atleast that will take alittle off not much to make it flat again if its warped.
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Julien D
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Post by Julien D »

More info on Ron Black?

Check the RB mods section on this site. All the info you could want is there.

http://kdxrider.net/forums/viewforum.php?f=110
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Post by KarlP »

'08 KTM200xc
'99 CR/KDX Hybrid with that RB stuff done to it
KX100 for the boy
novack2007
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Post by novack2007 »

ok so i got 2 work on the bike 2day. took cylinder off and the plating is gone on the intake side and the whole power valve system is toast. i need a cylinder anyone know someone that has a good used one with a good power valve setup in it or a place too get good price on a fully loaded new cylinder?
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Post by Fletch »

That's pretty normal. Don't sweat it too much. Send the cylinder off. I bet you have a crack in it just under the exhaust port running down. Again no biggie. I also bet the center powervalve is fine and so is the metal shaft with the gears cut into it. I would bet that your 2 side valves are pooched but the idler on the right side is ok. Did you support the vertical shaft actuator when you loosened the left hand thread nut on top of it? Hope so. I've heard that Honda parts has the cheapest price on powervalves for the e-series. So look there.
If you have any of the parts I listed as probably ok that arn't then let me know as I have spares. I also have a spare junk cylinder for replating but you don't need 2 of those.
Hey, at least you know what you got eh?
Fletch
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Post by Julien D »

cheapcycleparts has the cheapest subvalves right now, as far as I know. Like $38 each.
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novack2007
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Post by novack2007 »

fletch- would u have a cylinder that has a good powervalve set up in it that u would wanna sell?
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Post by Fletch »

No I have most of it, the rod, idler, r-hand valve, but the l-hand one is pooched. My cylinder is pretty bad but probably re-buildable. I'm not sure if you need any of that stuff. show us some pics of your powervalves.
Fletch
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Post by novack2007 »

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so there it is. fubar just fubar.[/img]
novack2007
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Post by novack2007 »

ok so i cant get the hold of posting pics yet.
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