TunaBro's 2003 CR125 build

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4/11/2020 6:37 PM

To start off, I have never torn down a bike and built it back up. Most I have done is swap out some exhaust and some bars and levers on my 2015 YZ250F. I found this bike and thought it would be a fun project and so far I am really enjoying it. YouTube and this site have been a huge help in figuring out a good game plan.

My goal is to freshen up the oem parts and make it my own in some areas as well.

Here it is the day I got it.

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Started to tear into it right away to really see what I was getting into.

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2015 YZ250F - 2003 CR125R

4/11/2020 6:41 PM

Started tearing down more parts and finding how neglected this thing was...

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Added an 07 intake boot.

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2015 YZ250F - 2003 CR125R

4/11/2020 6:45 PM

Then the ugly...

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2015 YZ250F - 2003 CR125R

4/11/2020 6:51 PM

And more ugly...

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2015 YZ250F - 2003 CR125R

4/11/2020 7:01 PM

Got the motor out today and started cleaning the frame. Not sure if I am gonna tackle it all by hand or have it vapor honed. Would be nice to save the money but would be awesome to just have it done with.

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That's all for now.

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2015 YZ250F - 2003 CR125R

4/12/2020 1:50 PM
Edited Date/Time: 4/12/2020 1:51 PM

Used the bench grinder to clean up a few parts today. Did these brackets and the subframe as well as pressure washed the frame. I will upload more pics along the way.

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2015 YZ250F - 2003 CR125R

4/12/2020 2:28 PM
Edited Date/Time: 4/12/2020 2:50 PM

Is it just me, I don’t see any pictures. Thanks for starting another cr build! I love these bikes.

Ok now I see them. I don’t know what was happening. Oh man the cleanup is the best part. I usually start with a steam pressure wash (not my own it’s at work) saves a lot of time for sure.

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5/18/2020 1:03 PM

Quick update:

More parts rolling in and I got my wheels mounted up with the tires. Stoked to see a few parts being completed.

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2015 YZ250F - 2003 CR125R

5/18/2020 1:07 PM

Oh, and I took my boys out riding a bit the other day. smile

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2015 YZ250F - 2003 CR125R

5/18/2020 1:55 PM

Got my graphics ordered up. I think this keeps up well with my goal to keep it oem+.

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2015 YZ250F - 2003 CR125R

5/18/2020 6:39 PM

I’ve been staring at those wheels at RM for almost a year and think the black/red/silver would look sweet! The graphics look like the newer crf style. Can’t wait to see it all together, looking good man.

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5/18/2020 7:44 PM

BToz wrote:

I’ve been staring at those wheels at RM for almost a year and think the black/red/silver would look sweet! The graphics look like the newer crf style. Can’t wait to see it all together, looking good man.

Thanks! I’m really happy with the wheels and I’m stoked to get the graphics in. I’ve got some fun parts lined up for this bike and hope to start to rebuild soon.

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2015 YZ250F - 2003 CR125R

5/19/2020 1:23 PM

It’s getting ugly...

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2015 YZ250F - 2003 CR125R

5/19/2020 5:47 PM

I can’t tell what the first photo is? Power valve linkage? It sure is rustē/corroded dang!! They have stuff like pb blaster and other rust eaters on the market, maybe soak it and then soak it some more then hot solvent tank?

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5/19/2020 6:07 PM

BToz wrote:

I can’t tell what the first photo is? Power valve linkage? It sure is rustē/corroded dang!! They have stuff like pb blaster and other rust eaters on the market, maybe soak it and then soak it some more then hot solvent tank?

Yep! That’s the plan. Taking it all apart and seeing if a good clean does the trick or if I need some parts.

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2015 YZ250F - 2003 CR125R

5/19/2020 7:17 PM

What are you using on the bench grinder for cleaning?

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Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.

5/19/2020 7:59 PM

Rickyisms wrote:

What are you using on the bench grinder for cleaning?

Prime Mx cleaning pads. They are awesome. Highly recommended.

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2015 YZ250F - 2003 CR125R

5/19/2020 8:31 PM

Rickyisms wrote:

What are you using on the bench grinder for cleaning?

TunaBro wrote:

Prime Mx cleaning pads. They are awesome. Highly recommended.

That’s what I figured. Been thinking of picking some up. Looking forward to following your build, I had a 2006 CR125 I enjoyed a lot.

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Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.

5/20/2020 10:10 AM

Rickyisms wrote:

What are you using on the bench grinder for cleaning?

TunaBro wrote:

Prime Mx cleaning pads. They are awesome. Highly recommended.

Rickyisms wrote:

That’s what I figured. Been thinking of picking some up. Looking forward to following your build, I had a 2006 CR125 I enjoyed a lot.

Thanks man. I am learning a lot as I go and I'm definitely stoked to get this thing moving along.

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2015 YZ250F - 2003 CR125R

5/25/2020 5:11 PM

Finished up the linkage and swingarm bearings and managed to get the broken bolt out from the exhaust port. I anticipated this being a pain but it maybe took 10 minutes. Stoked for that!
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2015 YZ250F - 2003 CR125R

5/25/2020 8:55 PM

Nice work! Just broken bolt = not bad... broken bolt because it was cross threaded = headache

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6/9/2020 11:14 AM

Looking good so far man, linkage and swingarm bearings are next on the list for my CR build...not looking forward to it at all haha

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6/9/2020 3:52 PM

deccr250 wrote:

Looking good so far man, linkage and swingarm bearings are next on the list for my CR build...not looking forward to it at all haha

Thanks! Im planning to take all my parts to the vapor blaster next weekend. Im super stoked to see the results!

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2015 YZ250F - 2003 CR125R

6/9/2020 3:58 PM

Spit the cases this weekend in preparation for vapor blasting and the full rebuild. Can’t wait to see how they turn out. Oh and had a rough go at getting that gear off in the last pic but a quick rental of a gear puller and it came right off. 👍🏼

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2015 YZ250F - 2003 CR125R

6/9/2020 7:38 PM

Where/who is doing the vapor blasting?

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6/10/2020 12:26 PM

BToz wrote:

Where/who is doing the vapor blasting?

Nexus in Shelton, Wa.

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2015 YZ250F - 2003 CR125R

6/11/2020 8:10 AM

Man, parts of my 05 were filthy but this thing, wow! On the positive side, you're gonna be so pumped when this thing is freshened up.

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6/11/2020 4:43 PM

seth505 wrote:

Man, parts of my 05 were filthy but this thing, wow! On the positive side, you're gonna be so pumped when this thing is freshened up.

Ha! Yeah I can't wait. Lots of parts being sent off for coatings and cleaning this week. Hopefully by the end of the month I can start some reassembly.

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2015 YZ250F - 2003 CR125R

6/13/2020 7:05 PM

More cleaning and more prep for vapor blast. But I’m there and ready. Photo
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2015 YZ250F - 2003 CR125R

6/13/2020 8:40 PM

I always wanted to find a cr like this and give it the love it deserved.. keep up the awesome work!

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