2003 Kx 125 - Project Fun25

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12/29/2013 7:40 PM

So after looking at all these awesome builds, I spent a few weeks searching for a good deal on a two stroke. I happened to come across this 2003 Kx 125 on craigslist. Was able to pick it up for $900. It hadn't been rode in over a year and a half. But being a two stroke, it started second kick! To the naked eye it is in decent shape. I went with a kawy due to local ties with a dealership. When it comes to a build, you'll take any help you can get!

I plan to post updates/pictures of the build as I go. Really excited for this to come together. I have been wanting to build my ideal "dream" bike for a few years now. Hope you guys like what is in store. I appreciate all comments and advise you guys provide.





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12/30/2013 8:22 PM

Best thing I ever did to mine was an .080" overbore with a slot up the back port. Increased low end and it revs out alot higher now.

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12/31/2013 8:07 AM

Pro circuit pipe and silencer and re-jet it. That's all I did to my 03 kx125 for mods but I did rebuild the motor too though. I realized how expensive the kawi parts are when we realized the kid didnt give us the governor with it Haha ( the bike was torn down in a box when I got it )

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1/1/2014 8:34 AM

Took a few hours to take it down to the frame and label what bolts go where. Easy to lose or confuse those suckers after months of building. Time to send the frame off to be powdercoated.








I was also about to find a PC works pipe from a form team green rider. It will need some work.

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1/1/2014 12:49 PM

What color will you go for on the frame? black?

Good luck with the build!

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#1
KX125

1/1/2014 12:53 PM

HenryA wrote:

What color will you go for on the frame? black?

Good luck with the build!

I think I am going to go with another color close to stock. I have seen some black ones but since Im doing black plastic, I think it may be little much.

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1/4/2014 7:04 AM

Before taking the motor apart I had already planned on replacing everything. Went with all OEM parts; Complete clutch, Crank, replaced every bearing and seal, new top end and going to have the head port and polished.



While waiting for parts to come in for the motor I went ahead and started cleaning up old parts with some elbow grease. Motor mounts are starting to look new again.


Out with the old parts and in with the new.

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1/8/2014 7:16 PM

Took the time to polish down the swingarm.

Before with the factory paint


After


Finally got the frame back from powdercoat and ended up going with a lighter silver than factory. It has a little bit of metal flake that makes it pop when in the sun light.



WIll be getting more parts in this weekend as well as suspension so the building can begin.

More to come!

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1/9/2014 10:26 AM

Very nice! Like the frame color.

I'd like to have the spare change to build up a cheap and lightweight 125 one of these days.

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1/9/2014 1:39 PM
Edited Date/Time: 1/9/2014 1:41 PM

TRON wrote:

Very nice! Like the frame color.

I'd like to have the spare change to build up a cheap and lightweight 125 one of these days.

Thanks Tron! If you look around you may be able to find some pretty cheap. It just comes down to how much work it needs and how far you're willing to restore it. Im learning the hard way. Once I think I have everything, more problems and parts are needed. BUT it'll all be worth it when its done.

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1/18/2014 6:49 PM

Finally got the rear suspension mounted up. Once the motor is back together it will be going in. Wheels to be laced up soon.

Some more parts that were delivered.




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2/16/2014 5:38 PM

It had been a while but have made some progress with this build. Next step will be getting the motor in.







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2/16/2014 6:21 PM

I'm really enjoying this rebuild; great pictures and a nice start to your project. How much money do you figure you have put into the bike aside from the $900 you paid for it initially?

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2/16/2014 6:37 PM

When you got the frame powder coated, did you have to plug up the bolt holes so the powder coating didn't get in them?

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2/17/2014 9:54 AM

EMA884mx wrote:

I'm really enjoying this rebuild; great pictures and a nice start to your project. How much money do you figure you have put into the bike aside from the $900 you paid for it initially?

I havent added up the full cost of the build yet. Im going to guess $2,500 - $3,000. But its almost completely brand new! My biggest cost was suspension. It was shot. I made the mistake of having all the stock suspension redone rather than update it to newer 250/450f suspension which would have been cheaper, if not the same but newer technology.

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2/17/2014 9:57 AM

casper wrote:

When you got the frame powder coated, did you have to plug up the bolt holes so the powder coating didn't get in them?

I dont think they covered them. There were a few I just had to poke the coating out but it was very light. I dont think it would hurt to cover or plug them though. I did have to sand down the inner diameter of the motor mount and swingarm holes so the bolts would fit due to the extra coating.

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2/19/2014 12:03 PM

Loving the frame color and the build so far!

Here's my 05 with throwback graphics
http://i114.photobucket.com/albums/n248/Jeekinz/KX125/IMG_5538.jpg

You can get those forks to work pretty good. If your familiar with digging into the valving I can give you my setup. I'm always tinkering with the stacks, but what I have now is pretty good. Remove the bladders and go up one spring rate (if you havent resprung it yet)

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04 KX125
94 KX250SM
75 Z1-900

2/20/2014 12:30 PM

Kidkawie wrote:

Loving the frame color and the build so far!

Here's my 05 with throwback graphics
http://i114.photobucket.com/albums/n248/Jeekinz/KX125/IMG_5538.jpg

You can get those forks to work pretty good. If your familiar with digging into the valving I can give you my setup. I'm always tinkering with the stacks, but what I have now is pretty good. Remove the bladders and go up one spring rate (if you havent resprung it yet)

I am hoping to have a lot of the build done this weekend. But Ive had the suspension completely redone. Seals, springs, etc. But once I go to service it, I may look at trying different settings.

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3/10/2014 7:20 AM

After a while of stripping the motor down, replacing every piece, besides the gears, it is finally back together. Did a little port and polish but that is about it for any modifications. Everything replaced is new OEM. Complete Clutch, Top End, Bearings, Seals, and Crank.

Before


After a heavy cleaning (New clutch cover on its way)




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3/26/2014 9:38 PM
Edited Date/Time: 1/31/2019 7:47 PM

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3/27/2014 1:19 PM

wsc96 wrote:

I used crossbuff balls. I found different sizes and compounds at Summit Racing. Then a lite wool to make sure I got all the lines in one direction. It takes a long time to get it just right but its well worth it if you dont mind the upkeep of keeping it that way.

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3/27/2014 2:37 PM
Edited Date/Time: 1/31/2019 7:48 PM

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3/27/2014 8:10 PM

you had me at "lines in one direction" isnt ocd cool?! looks great. we need a video of it getting the legs stretched out. a 125 is on my list for shop fun and my boy is getting closer to that size bike.

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If I'm healthy enough to complain. I shouldn't be complaining.

3/27/2014 8:15 PM

Kidkawie wrote:

Loving the frame color and the build so far!

Here's my 05 with throwback graphics
http://i114.photobucket.com/albums/n248/Jeekinz/KX125/IMG_5538.jpg

You can get those forks to work pretty good. If your familiar with digging into the valving I can give you my setup. I'm always tinkering with the stacks, but what I have now is pretty good. Remove the bladders and go up one spring rate (if you havent resprung it yet)

kidkawie,the dog looks like hes thinking "umm,in the house?really?" lol.

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If I'm healthy enough to complain. I shouldn't be complaining.

3/27/2014 8:18 PM

Damn nice build! Good work. Cant wait for the finished product.

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well we ain't the smartest folks in the world...i mean we're fucking dirtbike riders for christ sakes.- BobbyM

If you chose not to decide you still have made a chioce.



3/28/2014 6:26 AM

Thanks guys! I should have some update pictures tonight or tomorrow. Still waiting on a few more parts that were backordered. A bike no longer made is hard to find parts for.

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3/28/2014 6:34 AM

B1rdman93 wrote:

Thanks guys! I should have some update pictures tonight or tomorrow. Still waiting on a few more parts that were backordered. A bike no longer made is hard to find parts for.

Tell me about it. Just finished a restoration on a 1982 CR125 last night.

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3/28/2014 7:42 AM

About keeping track of the hardware, the Kawasaki parts diagrams lists the bolt size in the part description. I bought a small metric steel rule just for that purpose since I'm constantly wrenching on Kawasakis.

They also (sometimes) list bearing, o-ring and sleeve sizes. For the bearings, they sometimes list alternat part numbers or bearing sizes in the description. You can Google that info for alternates.

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04 KX125
94 KX250SM
75 Z1-900

3/28/2014 8:27 AM

Kidkawie wrote:

About keeping track of the hardware, the Kawasaki parts diagrams lists the bolt size in the part description. I bought a small metric steel rule just for that purpose since I'm constantly wrenching on Kawasakis.

They also (sometimes) list bearing, o-ring and sleeve sizes. For the bearings, they sometimes list alternat part numbers or bearing sizes in the description. You can Google that info for alternates.

I actually had luck keeping it all organized and I bolts were easy to find. Im just waiting for clutch cover mainly.

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4/3/2014 8:31 AM

Slowly, but surely adding new parts. I should have everything complete and ready to fire up next week. This build has made me eager to want to build another. Hope everyone has been enjoying so far. I know I have!













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