2004 KX125

gs317
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111
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3/10/2020
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Reno, NV US
Fantasy
475th
Edited Date/Time 3/17/2021 11:05am
After a 3 year hiatus from moto I decided to venture back into the dangerous waters, and decided I would do so on a kx125. I waited over a year, maybe even two before I found one that was the right year(04-05) and for the right price(cheap), while not being a complete cash sink, which this will likely be anyways because motocross. The bike was ok in the one pic I saw, and upon close inspection in person it only got uglier. The bad: sat for the most part in a shed for 10 years with a ride once a year, tires are from 2007, clamps are twisted, intake boot cracking, brake lines are sun damaged, filthy motor, broken plastic, mismatched bolts, wobbly rear wheel, suspension has never seen a wrench and leaks. The good: motor fired up first kick every time I tried, without choke, guy claims it's got 20 to 25 hours(we'll see how she looks soon enough), and claims a fresh clutch and basket(again, we shall see). So I gave him 1100 and took off.











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DrewJett747
Posts
154
Joined
5/22/2018
Location
Belleville, IL US
3/19/2020 6:00am
Overall it looks like a solid buy. Nice find!

I've given the same amount of money for bikes in far worse condition .I have pictures to prove it
gs317
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111
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3/10/2020
Location
Reno, NV US
Fantasy
475th
3/19/2020 7:27am
I started digging into the bike last week to replace the intake boot and found that the carb wasn't seated properly and I could pull it out of the boot with one finger so im now nervous about how the engine looks, I also scratches that look like tool marks inside the carb throat
gs317
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111
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3/10/2020
Location
Reno, NV US
Fantasy
475th
3/21/2020 8:11pm
Got the bike mostly stripped down, and while I found a lot of dirty parts and worn bearings, not unexpectedly, I found a few surprises that I would have rather eaten a trash sandwich than have to deal with.
First, the subframe: has a crack on the upper mount, could be welded and good to go, but the left side mount was allowed to get loose and it was shaved thin and the bolt hole was wallowed out, mmmm tasty

Second helping: the swingarm pivot bolt was put in backwards, not sure how they didn't notice the d shaped hole the frame has to hold the bolt flats but I guess they were that dumb and determined. Not the worst....
The frame is cracked on the backside by the swingarm pivot holes...
I can get a brand new frame, buy a used frame(of I can find one), or get this one repaired which should be do able if there are no other issues. Suggestions?





gs317
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111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
3/22/2020 5:10pm
Down to the frame which is getting the paint stripped before I send it to get welded, cleaned, and coated/finished.

Debating pulling the motor apart to get vapor cleaned



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The Shop

Phillip_Lamb
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1924
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12/14/2010
Location
ORANGEVALE, CA US
Fantasy
2362nd
3/22/2020 11:08pm
gs317 wrote:
Down to the frame which is getting the paint stripped before I send it to get welded, cleaned, and coated/finished. Debating pulling the motor apart to...
Down to the frame which is getting the paint stripped before I send it to get welded, cleaned, and coated/finished.

Debating pulling the motor apart to get vapor cleaned



it might be worth it to know if the bottom end parts are solid
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gs317
Posts
111
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Location
Reno, NV US
Fantasy
475th
3/23/2020 6:11am
gs317 wrote:
Down to the frame which is getting the paint stripped before I send it to get welded, cleaned, and coated/finished. Debating pulling the motor apart to...
Down to the frame which is getting the paint stripped before I send it to get welded, cleaned, and coated/finished.

Debating pulling the motor apart to get vapor cleaned



it might be worth it to know if the bottom end parts are solid
Big brother strikes again

But ya that's what I'm thinking, with the condition of the rest of the bike I don't think I should leave that to chance
gs317
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111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
3/29/2020 5:23pm
Another weekend another update:

Got my subframe in, big shout to Tyler285 for helping me with that. Also hooked it up with a new chain slider.

Frame is at the welders and I hope to get that back Monday and take it to the powder coaters this week.

Took the top end off, cylinder and head look fine, crank play seems good. The piston is clean but has some wear I the front I can feel so im going to do a top end kit. Also looked at the clutch and to my delight the guy didn't lie, had a brand new clutch kit and basket. So bit of a win with the motor.

And for kicks a potential graphics mock up.





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3/29/2020 9:17pm
The plating is starting to wear on the cylinder you can see around some of the ports. The lighter coloring starting to happen. Means the plating has worn thin in those spots. Like on the lower edge of the exhaust ports it has started to wear away.
gs317
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Reno, NV US
Fantasy
475th
3/29/2020 11:12pm
I'll get it checked out, thanks!
ledger
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Location
TN US
3/29/2020 11:39pm Edited Date/Time 4/7/2020 12:02am
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
3/30/2020 10:49pm
Today in the shop things went from bad to worse.

First: Got a used subframe. Seemed fine at first but upon trying to put it together realized a piece was broken and it was kinda bent.

So I moved onto working on the swingarm. All was well pulling bolts, and then the left axle adjuster happened. It got stuck, then snapped.Oof.

So to recap: Frame was cracked(now welded), Subframe was cracked, new one was not any better and my swingarm is all dunged to hell.

I did inspect the cylinder closer and didnt notice anything really worrisome about the coating. If anyone has a stash of parts, well, at this point i need a roller i think Sad
gs317
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111
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3/10/2020
Location
Reno, NV US
Fantasy
475th
4/3/2020 10:13pm
New update:
Swingarm is getting repaired at the shop
Subframe has been welded and repaired
Frame has the first coat of paint
And the motor is back together with a fresh top end

I'll post pics later, forgot to take some, also doing a thing tomorrow, I'll post pics if it works out like im planning
gs317
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Location
Reno, NV US
Fantasy
475th
4/4/2020 1:01pm
Not the prettiest repairs but they look much better than before, I need to scrub the subframe and give it a brushed/ polished finish






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gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/5/2020 4:00pm
I might have gotten another
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gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/5/2020 5:38pm
Another 04 kx125 to go with my project

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ledger
Posts
3673
Joined
1/17/2013
Location
TN US
4/5/2020 10:48pm Edited Date/Time 4/6/2020 12:55am
gs317 wrote:
Another 04 kx125 to go with my project [img]https://p.vitalmx.com/photos/forums/2020/04/05/417178/s1200_received_553204532275080.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2020/04/05/417177/s1200_received_290720988584681.jpg[/img]
Another 04 kx125 to go with my project

That bike is NICE !!!! I would throw rocks at the other one...jk. Share some details on the new one if you don't mind ? and if ya don't like the carbon fiber chain guide...just let me know, lol. Seriously, that bike looks to be well cared for, and congrats.
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gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/6/2020 1:54pm Edited Date/Time 4/6/2020 1:55pm
It was built by cclay47, he had a thread on here with the build, and sorry, parts aren't for sale Smile
2
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/6/2020 9:43pm
Who likes clean parts? Here ya go

Also got a pc works pipe for the project to match



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gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/9/2020 12:13am
Alright, I could use some input

The frame is now painted black and the swingarm is currently being stripped.

Should I make the swingarm brushed aluminum with a clear coat, silver/ stock, or black to match the frame?
4/9/2020 12:40am
Brushed aluminium with a clear coat would be sick. What kind of clear coat would you use?
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gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/9/2020 6:47am
Im spray painting on this go around due to budgets, using rustoleum
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/9/2020 7:02am
Im spray painting on this go around due to budgets, using rustoleum
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/14/2020 11:04pm
So I heard y'all like updates:

Got the swingarm bearings and got the frame paint finished along with the swingarm

I'll be cleaning the radiators and putting those on next, getting fluids in the bike, and getting the suspension cleaned and mounted, I still need to rebuild it but I want the bike rolling again so I can take it on an easy break in ride to check all the nuts and bolts, then I'll do the rebuild and tires if everything else checks out






1
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/15/2020 6:53am
I scrubbed it by hand, used wd40, green scrub pads, wire brushes, and a pick for stuck dirt in the tight areas
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gs317
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111
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3/10/2020
Location
Reno, NV US
Fantasy
475th
4/15/2020 11:23pm
And more progress, got most of the front end on, working out the cable routing before I put on the radiators and move to the rear

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cclay47
Posts
561
Joined
11/7/2015
Location
Roseville, CA US
4/16/2020 10:51pm
Good progress man keep up the good work!
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/16/2020 11:32pm
Currently on track to have it back together by this weekend but I'll probably be taking the other bike on the maiden voyage Sunday
gs317
Posts
111
Joined
3/10/2020
Location
Reno, NV US
Fantasy
475th
4/22/2020 10:40am
Ooooohhhhh boy almost there, waiting on some parts and tools for suspension while I work on the wheels. Also took out the new race bike for that first ride shake down and boy that's a fast bike. Super stoked on it. Now to get the practice bike done so I can train more and use it for testing Smile



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WW444
Posts
492
Joined
10/2/2016
Location
Decatur, AL US
4/23/2020 9:35pm
gs317 wrote:
Another 04 kx125 to go with my project [img]https://p.vitalmx.com/photos/forums/2020/04/05/417178/s1200_received_553204532275080.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2020/04/05/417177/s1200_received_290720988584681.jpg[/img]
Another 04 kx125 to go with my project

I hear you! I have been looking for another kx125 while I still haven'f finished my current 04 kx125 build lol My current one will be a PC style build but I would like to do a clean stock resto look as well
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