KX Riders
Maintenance & Technical => KX250 / KX125 => Topic started by: justjimmy999 on January 02, 2014, 02:17:40 AM
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I am considering a rebuild of the engine. Will a 1993 engine and parts fit? I am a newbie to this site, and the KX in general. I have had it for years but its day has come. Will not cold kick start. I can roll start down a very long decline. It runs horrible, eats oil, still has some power though. Any suggestions? Also the shift lever pin broke in second. I need to tear down to replace that. Looking for any and all suggestions. Also interested maybe in buying a complete engine or willing to sell bike
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92 and 93 were the "J" models...so most parts, if not all will interchange.
If you can only get it started by rolling down a long hill, more than likely your top-end is smoked....a simple compression test can verify that....might as well do a leak down test too....if it's smoking real bad and eating oil, it could very well have a bad main seal.
Post up a couple pics...lets have a look at the ole 250.
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I will gladly post some more photos later tonight. Here's a couple for now. Ill take some good ones of the engine etc. BTW, it has a new Stator, and plug. I figured as old as it is couldn't hurt for me to tear it down and take a look.
https://www.dropbox.com/sh/qirqgp3mfklm6wm/rUWgQObSA2
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it's all there...looks good.
if you're gonna keep it, then yeah I would pull the motor, split the cases and replace all bearings and seals and anything else that looks questionable, get a new crank(if available), replate the cylinder, and a fresh top-end...and ride it.
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Thanks. I found a 93 in my town to pull gear shift pin off. Was looking to buy a "complete" rebuild kit. Im a car guy, so I am curious is there any need to re-bore this thing? Or is that asking for more problems. The forks are good, rear suspension is actually still very solid. I have 2 sets of plastics(save radiator guards, which I need). Plus I just like it. Clutch is not so good, but would add that to rebuild. If I can come out under $400 ill give it a go. If not, ill probably part it out. This thing is still fast, but wont climb worth a d**n. Any suggestions or warnings about where to get parts?
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the chances of coming out of it for $400 or less are...nill. Probably be more like $1000+ to do it
right. If you do a ghetto rebuild, you could keep inside the $400 limit....but I'd get rid of it soon if you go that route :wink:
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the chances of coming out of it for $400 or less are...nill. Probably be more like $1000+ to do it
right. If you do a ghetto rebuild, you could keep inside the $400 limit....but I'd get rid of it soon if you go that route :wink:
+1
Completely rebuilt is expensive but if everything is done properly you're basically running a brand new engine that if proper maintenance is done will last for a long time. Couple years ago I completely rebuilt a 91 250 and grand total with all gaskets, seals, piston kit, replate cylinder and a brand new wiseco crank was real close to $1400 USD. Well worth it when you are on a trail many miles from home and civilization.
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Would it really cost that much? I found a hot rods/vertex piston kit that covers the top and bottom end for $430. A cylinder replate is $200 or so.
What am I missing? I might have to do the whole shebang to my 03.
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I greatly appreciate all the info. Sadly I have done some research and math. I believe I am going to part out this old horse. $1400 goes a long way to a newer bike. I did love the way this bike hopped though. Good model and was real tuff. Took a long beating for 20 years. So I can not complain. Anyone looking for parts? LOL!
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Would it really cost that much? I found a hot rods/vertex piston kit that covers the top and bottom end for $430. A cylinder replate is $200 or so.
What am I missing? I might have to do the whole shebang to my 03.
stay away from hot rods...they don't last...OEM is the best way to go, if they're available.
I've never used a vertex piston so I can't say anything about them, I run a wossner in my 250.
you could save a handful on the bearings if you go to a local bearing shop....but you're still gonna be either side of a grand.
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d**n...
From a bit of googling it looks like vertex makes KTM's OEM pistons.