Maintenance & Technical > KX250 / KX125
My 1999 KX250 Build
mjowen:
Hey, everyone -
Figured I'd post to keep track of the progress i make on this.
I've been looking for a project bike to give me something to do and decided i'd get into the dirt world. Was searching craigslist on saturday and stumbled upon a 1999 KX250 a couple hours north of me. The motor was locked and the guy was selling as is. Ended up making an offer and after a little back and forth we agreed on 500 bucks for it. So, i finished my mimosa and headed up to Cheyenne to pick it up.
Again, this is my first jump into the dirt world and my first 2-stroke ever. Not quite sure what i'm getting myself in to but we'll see how it goes haha.
The bike is in alright shape overall but definitely needs some mechanical work and some TLC.
The plan for the bike is as follows:
- Top and bottom end rebuild
- All new fluids, plug, filter, etc
- New plastics
- New graphics
- New chain kit
- Possibly powdercoat the frame (we'll see how frisky i'm feeling); prior owner painted it black and it's of course chipping now. Might just sand it and repaint it, not sure.
- New front and rear tires
- General cleaning
Heres a quick pic after unloading it and putting it in the garage:
As of tonight, i've accomplished the following (which i've hopefully done right):
- removed the seat and plastics
- removed the tank
- removed the exhaust
- drained the coolant and oil
- removed the radiators
- removed the carb (although i left it mostly connected)
- removed the top end
Someone obviously started this project and didn't do anything with it. First off, there was no gasket on the top of the head. Second, once i got the top end off i found the piston to simply be sitting inside the cylinder, on top of the connecting rod. Needle bearing was inside the piston as well. I've got a list going of the parts and pieces i'll need to buy but i'm sure i'm going to be needing everyone's help since this is my first attempt haha...i've noticed a couple things such as a random hose missing on the carb, bolts missing, exhaust basically held on with the springs and two bolts, few other things; but i'll figure those oddities out later.
Here's how she sits at the moment:
The tear down has seemed to go just fine so far and i dont believe i've done anything wrong...at least i hope i havent haha.
Not quite sure what i'm going to do next...of course i still need to get the bottom end torn down but i still need to do a bit more reading up on this and then re-watch how to put everything back together.
If anyone is around Denver and wants to help a noob, lemme know haha
Foxx4Beaver:
Not a bad buy for $500.
Before ya go any further, you should get yourself a Service Manual...if you haven't already. :mrgreen:
mjowen:
Yep! I actually downloaded a PDF manual the day I brought it home haha
Did a little more work on it tonight:
Got the remaining plastics removed (minus the fork guards, will do those when i remove the fork and do the fork seals)
Chain removed
And removed the bottom end
I'm going to be going to a guys place next week saturday to split the case and figure the rest out (he's familiar with this, i'm going to learn lol)
Tomorrow or maybe next week:
- remove the sub frame
- remove the swingarm
- remove shock
- remove fork
Then i'll get some pics of the wiring so i know where it all goes and will remove that...then i'll have the powdercoat done.
Parts list is mostly together pending anything crazy with the bottom end. Hoping to have the parts ordered within a couple/few weeks and will then start putting it back together.
umberto:
If you have not purchased your piston yet, consider getting a Wossner. Several very knowledgeable engine builders on this site swear by them. I put one in my 500 conversion, and I was very impressed with the quality and finish. They also make very nice rods if you are going to rebuild the bottom end. On this site, Sandblaster or alward25 are Wossner dealers if you want to buy from someone you can trust.
mjowen:
--- Quote from: umberto on March 06, 2018, 02:47:11 PM ---If you have not purchased your piston yet, consider getting a Wossner. Several very knowledgeable engine builders on this site swear by them. I put one in my 500 conversion, and I was very impressed with the quality and finish. They also make very nice rods if you are going to rebuild the bottom end. On this site, Sandblaster or alward25 are Wossner dealers if you want to buy from someone you can trust.
--- End quote ---
I greatly appreciate the suggestion, man. I havent purchased any of the parts for the rebuild yet...i figured i'd get the full tear down done, write a parts list knowing what i need, research them, and then pull the trigger on parts.
I'll be sure to look into those wossner pins...i'll be doing the bottom end rebuild as well so will look at them, too!
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