2005 YZ250 - Ship of Theseus

The toyota tacoma, the glock 19, the aluminum frame YZ250. What do they all have in common? They're all exceedingly boring and I own each 1 of them. 

They also have one of the best advantages any platform can have; they've made a billion of each and parts are plentiful and cheap.  Thank god for that because this one is tougher than $2 steak.

How it showed up on marketplace, wrong year, wrong model, perfect for a moron like me. 

image 2664image 2665

$2200 later and it was in the bed of my Tacoma:

B9592CFD-4B9E-4075-B499-1F41181B5280 1 105 c.jpeg?VersionId=7

Every bike's a story, and this one could rival Tolkien's creative writing. 

The clutch cover, forks, and shock tell me this thing might have 15 hours.  The eBay chinesium levers, pegs, and case saver tell me somebody bought this bike and got scared of the YZ power. 

Missing a gasket near the power valve, the base nuts have no marks so this one has me puzzled:

11238AFC-AE36-4E18-A50A-DD582A889C86 1 105 c

I've seen bad packing, I've seen little packing, I can't say I've found NO packing before 

EC44561D-ED6B-499D-9731-AF7C5BF119CC 1 105 cD6DFB208-AFB5-4A01-B42E-16C228BBF6E7 1 105 c

God wept when he heard this thing start, the story written here screams 'lugged at 500 rpm for 20 years'

5797B58B-ECA8-4E37-9363-234E4F26853D 1 105 c.jpeg?VersionId=l4ld0HpHrfULsy6o1RQVSIMnX7

Alright now we're getting somewhere, these are almost too easy to take apart 

C5FB7C9F-EC9E-43D9-B52C-CE87CE7F0C31 1 105 c.jpeg?VersionId=2oSX41GQZ67456F206-02B9-4C53-81B4-650DEFC21078 1 105 c.jpeg?VersionId=UOUYo

Somebody threw a chain somewhere, swingarm is gouged and cracked enough for me to not want to use it any more, the ship of theseus continues.

EA3DCB01-DEDB-4207-B6DF-FDBC4D891C82 1 105 c

This is a first for me. I need ton know how this happened, but it's between this bike and god. 

97111352-53DB-4463-90B5-AE267372F51C 1 105 c.jpeg?VersionId=BFS9E

Stripped down to a rolling frame and restoring the aluminum today. I'll be using Cody Schock's mechanic's guide on cleaning it down and getting a matte finish.

14
|
sandman768
Posts
7912
Joined
3/21/2014
Location
Saratoga Springs, NY US
2/28/2026 6:11am

Thats rough….I think when you apply generic rockstar graphics the silencer packing melts away instantly….hopefully the transmission gears are not all worn out, thats when it adds up quickly….

5
3/1/2026 9:30am

What was that line from happy gilmore? My fingers hurt? 

My hand hurts lol. 519 LC cases ready for loading with 77gr SMKs for my 20”  AR. : r/longrange

If ben stiller really wanted to punish old people, he wouldn't threaten landscaping, he'd threaten cleaning an aluminum frame YZ250. In 2004, somewhere  outside of Tokyo near Iwata in Shizuoka prefecture, an engineering team designed this frame with a myriad of crevices, indents, and different textures on the frame. And you know what I have to say? Fuck those guys, cleaning this sucks.

I started off with car wash soap, a bristle brush, and just elbow grease to try and knock the dirt off.  

image 2672image 2673.png?VersionId=SM2UTgZ8eNZ.TxOt8IXLl FIf

Now for the fun spots: 

image 2674

Next came all purpose cleaner and some steel wool:

image 2675

We're getting.........somewhere, but I'm not thrilled with how it looks.  

Next step is to hit it with Aluminum Brightener + Red Scotch Brite, Red Scotch Brite + Dawn, Gray Scotch Brite + Dawn, and then finally SOS + Dawn.  Am I gonna do that tonight? Probably not, I'm probably gonna drink beer instead.

12
YZed250
Posts
1311
Joined
11/9/2014
Location
Costa Mesa, CA US
3/2/2026 11:45am

I put a year or two of hard racing on a 2005 YZ250 in 2005. Sold the bike looking respectable and running well but obviously worn from MX/off-road 2-3 days a week, racing all over. Sometimes I wonder what happened to that old bike ... then I see threads like this. 

2
3/2/2026 6:26pm

Scrolling marketplace today led to an incredible find; a 2016 YZ250 roller that was mis-labeled, mis-taken, and mis-used for christ knows how long.  Not sure if God was smiling down upon me when I named this thread, but this really is the ship of theseus now.  I'll be swapping the engine, fuel tank, radiators, exhaust, carb, subframe, and seat on to this bad boy. 

image 2680.png?VersionId=HD.EBLsbWaCoarsUR7NvdNuEop5B

$250 later and it was in the bed of my truck

IMG 3345 2

Home and ready for a deep clean

IMG 3347 2
7
1

The Shop

YZed250
Posts
1311
Joined
11/9/2014
Location
Costa Mesa, CA US
3/2/2026 6:38pm

Full send! I like it, haha. 

Buying a second bike for parts ... gonna be a minute till the YZ250 spares crate is empty. 

3/2/2026 7:20pm

Lucky. All I get in my Marketplace ads are $800 Apollos and thousand dollar XR100s, which are always missing half the plastic, yet always have spoke covers.

2
3/9/2026 6:14pm

DO NOT LET PERFECTION BECOME THE ENEMY OF PROGRESS

IMG 3381.JPG?VersionId=1bCBjdb9cJcX.hrh5K5Ur

I've yoinked the ol' motor and swapped in the 05. The full frame scrub and love will come at a date yet to be determined, I want to ride this thing.

IMG 3383.JPG?VersionId=FqToHcwnHQAmfLjc1

Looking at this bottom end requires a penicillin shot.

IMG 3385 1.jpg?VersionId=

 

6
YZed250
Posts
1311
Joined
11/9/2014
Location
Costa Mesa, CA US
3/11/2026 10:47am

Makes me wonder how literally everything can be broken at the same time on some people's bikes. 

Nice work on swapping the good motor into the good frame. Hopefully you have access to a vapor blaster to help with the cleanup and can get a little bit of return on your investment (seat time!). 

3/13/2026 1:17pm

I'd like to send whoever stripped this sub-frame bolt a bag of my dog's fecal sample.  Bringing the bike to a welder tomorrow to weld a nut on and finally get it out after it ate my Irwin Hanson extractor bit. 

 

IMG 3397

 

IMG 3401 0

In the meantime, I've re-blued the welds and re-packed the muffler to keep building progress. 

IMG 3404IMG 3405
5
3/14/2026 11:43am

Local welder/alchemist/witchcraft expert had this bolt out in about 30 minutes of working it.  Nice to find somebody whose skill can be seen just from the damn workshop when you pull into their house.

IMG 3409.JPG?VersionId=J1qMhvG3Toc28PVu

With that said, when I got home I re-installed the new subframe, the exhaust, kickstarter, shifter, and tried to get the new chain slider in.  This is the pinnacle of italian engineering folks.  I swear, Acerbis may as well say FIAT on the side now; if you ever meet somebody that works in Acerbis engineering and especially QC, kick them in the balls for me.

IMG 3410.jpg?VersionId=v7PY4QfqV9ZHnC

Here's how she's sitting as I head to the brewery 

IMG 3413
2
Banana_oil
Posts
521
Joined
10/20/2011
Location
Gothenburg SE
3/14/2026 3:19pm

I think the chain guide was changed around 2010 so you may have gotten the newer version?

1
3/14/2026 3:51pm
Banana_oil wrote:

I think the chain guide was changed around 2010 so you may have gotten the newer version?

Don’t tell Rocky Mountain that when I request a return!

BoxcarWilly
Posts
1093
Joined
10/5/2023
Location
Thunder Bay, ON CA
3/25/2026 7:17am

Yeah that's the new style. I had the same issue.

3/27/2026 8:24pm

It's friday night, Alice in Chains is blaring in my garage, and I am 99.5% ready to go ride tomorrow. 

Sorting through the carb on re-assembly, when I turned the gas on, it would piss fuel everywhere.  Found the first cause was a piece of the needle that most likely degraded over 20 years, cleaned, re-assembled, bent the float, and voila, good as new.

IMG 3467 2

After that, try as I might I could not get the bike to start. Tried fresh gas, tried a new spark plug, nothing. Finally after brainstorming and reading countless old threads, I unplugged the kill switch and it fired on I kid you not, the 2nd kick.  Was a beauty to hear run.

Finally, I moved on to new twinwalls, new grips, new clutch cable, and a brand new ARC lever and perch.

 

IMG 3505 5

Here's how it's sitting tonight in my garage before I go ride tomorrow.  The front axle is for whatever reason pulling 95% through; googling it seems to bring up that the axle spacers might be backwards, but I'm struggling to see how that could be the case.  Either way, I'll solve it tomorrow morning, or I won't. Time for wine.

IMG 3536 3IMG 3537 2
6
3/28/2026 6:52am Edited Date/Time 3/28/2026 6:53am

Anybody know what might’ve causing the axle to not pull through all the way?

IMG 3539 3.jpeg?VersionId=Uj4BUNvL T JzBFKeUTXPxf I
Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem okay.

1
3/28/2026 6:47pm

Today went well. The bike didn't need a single adjustment save for a few bolts getting torqued and adjusting the brake lever up.  All in all, couldn't ask for more from the maiden voyage.  This is my 3rd or 4th YZ250, and this one is by far the hardest hitting.  The PC pipe combo with T2 is unreal and this thing revs to the moon.  I will not be touching the carb again as this thing is jetted absolutely perfectly.

IMG 3540 3.jpeg?VersionId=PeZ73iba RGMRzXC4T

I have not ridden a 2 stroke in nearly 5 years.  I need to lose about 30 pounds as well, but I can't believe how much fun I had. 

Could have gone without blowing both fork seals in the bed of my tacoma but like Johnny Cash said, I'll take it one piece at a time.

IMG 3558 4
5
3/29/2026 10:34pm
Anybody know what might’ve causing the axle to not pull through all the way?Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem...

Anybody know what might’ve causing the axle to not pull through all the way?

IMG 3539 3.jpeg?VersionId=Uj4BUNvL T JzBFKeUTXPxf I
Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem okay.

Could it be an older axle? Like 07 and older. Also the spacer on the non brake caliper side kinda looks to long. 

2
1
3/30/2026 1:46pm
Anybody know what might’ve causing the axle to not pull through all the way?Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem...

Anybody know what might’ve causing the axle to not pull through all the way?

IMG 3539 3.jpeg?VersionId=Uj4BUNvL T JzBFKeUTXPxf I
Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem okay.

mwilcox349 wrote:

Could it be an older axle? Like 07 and older. Also the spacer on the non brake caliper side kinda looks to long. 

I am thinking it's a combo of wrong axle + wrong spacers. I'm just going to order new ones, not a ton of stuff to get wrong here.

1
YZed250
Posts
1311
Joined
11/9/2014
Location
Costa Mesa, CA US
3/30/2026 2:28pm

Looking good, Captain @SeaClassExpert !

Sounds like a slipping clutch or possibly a dragging left pointer finger knuckle? 

seth505
Posts
10170
Joined
4/1/2008
Location
SD, CA US
3/30/2026 2:29pm
Scrolling marketplace today led to an incredible find; a 2016 YZ250 roller that was mis-labeled, mis-taken, and mis-used for christ knows how long.  Not sure if...

Scrolling marketplace today led to an incredible find; a 2016 YZ250 roller that was mis-labeled, mis-taken, and mis-used for christ knows how long.  Not sure if God was smiling down upon me when I named this thread, but this really is the ship of theseus now.  I'll be swapping the engine, fuel tank, radiators, exhaust, carb, subframe, and seat on to this bad boy. 

image 2680.png?VersionId=HD.EBLsbWaCoarsUR7NvdNuEop5B

$250 later and it was in the bed of my truck

IMG 3345 2

Home and ready for a deep clean

IMG 3347 2

"Good day sir, I'd like to make an offer on your BIG YAMAHA DIRT BIKE". Score 😄

4
4One7
Posts
76
Joined
12/6/2016
Location
Parkton, NC US
3/31/2026 5:16am
Anybody know what might’ve causing the axle to not pull through all the way?Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem...

Anybody know what might’ve causing the axle to not pull through all the way?

IMG 3539 3.jpeg?VersionId=Uj4BUNvL T JzBFKeUTXPxf I
Spacers are correct, doesn’t seem to be a fork lug issue, tolerances seem okay.

Your wheel spacer looks wrong. The spacer shown should be half that width and the axle should protrude on the hub side of the fork leg. This is likely a reason why your fork seals didn’t last also.

Hope this helps.

2
BoxcarWilly
Posts
1093
Joined
10/5/2023
Location
Thunder Bay, ON CA
3/31/2026 6:38am

The bigger spacer is on the brake side. Took 15 years of owning YZs to drill that into my head 😂😂

2
3/31/2026 7:39am
4One7 wrote:
Your wheel spacer looks wrong. The spacer shown should be half that width and the axle should protrude on the hub side of the fork leg...

Your wheel spacer looks wrong. The spacer shown should be half that width and the axle should protrude on the hub side of the fork leg. This is likely a reason why your fork seals didn’t last also.

Hope this helps.

Yeah, makes complete sense. I'm going to order the Tusk spacers for $10 and see if that shakes it out.  I agree it looks funked up from the get go, I'd also guess that sitting in East Dallas outside for 6+ years didn't help those forks.  At least they felt great on the track!

3/31/2026 7:44am
YZed250 wrote:

Looking good, Captain @SeaClassExpert !

Sounds like a slipping clutch or possibly a dragging left pointer finger knuckle? 

Definitely a finger dragging, clutch feels incredible for something that's 21 years old.  i'll inspect the fibers and plates when I do the oil after the next ride, but the ARC lever made it possibly feel better than it had any right to.

 

I'm also just fat and have to feather the bike to get it out of the sand in E Texas tracks.

1
4/12/2026 6:20pm

Axle problem solved, a combination of wrong spacers and wrong axle caused the issue. Bonus points to anybody who can guess the bike that this combo is actually off of 

IMG 3656IMG 3665

Here's how the bike's sitting now; 180 decals is printing my numbers up now, debating whether or not I want to try and build a spare set of blue wheels in the meantime, but damn if blu on silver ain't clean.

IMG 3668.jpg?VersionId=ASyDrfvXetc2hLpPOfZGBVXugk1vlKI

Next problem I need to address is this rounded out brake pad holder bolt, it's insane how corroded some of the bolts were on this 2016. 

IMG 3669.JPG?VersionId=CThjzZ Y2IPq7a5ZLZ0jAA1ZdZ
2
Zesiger 112
Posts
2317
Joined
3/4/2013
Location
Galveston, TX US
4/13/2026 12:39pm
Axle problem solved, a combination of wrong spacers and wrong axle caused the issue. Bonus points to anybody who can guess the bike that this combo...

Axle problem solved, a combination of wrong spacers and wrong axle caused the issue. Bonus points to anybody who can guess the bike that this combo is actually off of 

IMG 3656IMG 3665

Here's how the bike's sitting now; 180 decals is printing my numbers up now, debating whether or not I want to try and build a spare set of blue wheels in the meantime, but damn if blu on silver ain't clean.

IMG 3668.jpg?VersionId=ASyDrfvXetc2hLpPOfZGBVXugk1vlKI

Next problem I need to address is this rounded out brake pad holder bolt, it's insane how corroded some of the bolts were on this 2016. 

IMG 3669.JPG?VersionId=CThjzZ Y2IPq7a5ZLZ0jAA1ZdZ

Possible to grab it between the pads with pliers and turn it out that way? 

4/13/2026 2:41pm

Possible to grab it between the pads with pliers and turn it out that way? 

Funny, that’s exactly what I had in mind. Hitting it with copious Kroil right now.

1
4One7
Posts
76
Joined
12/6/2016
Location
Parkton, NC US
4/14/2026 4:39am
Axle problem solved, a combination of wrong spacers and wrong axle caused the issue. Bonus points to anybody who can guess the bike that this combo...

Axle problem solved, a combination of wrong spacers and wrong axle caused the issue. Bonus points to anybody who can guess the bike that this combo is actually off of 

IMG 3656IMG 3665

Here's how the bike's sitting now; 180 decals is printing my numbers up now, debating whether or not I want to try and build a spare set of blue wheels in the meantime, but damn if blu on silver ain't clean.

IMG 3668.jpg?VersionId=ASyDrfvXetc2hLpPOfZGBVXugk1vlKI

Next problem I need to address is this rounded out brake pad holder bolt, it's insane how corroded some of the bolts were on this 2016. 

IMG 3669.JPG?VersionId=CThjzZ Y2IPq7a5ZLZ0jAA1ZdZ

Looks like the axle and spacers from the 05 front end, used on the SSS stuff.

For the brake pad pin, I’d suggest using heat and trying to hammer in a torx socket for a bit more bite. If all else fails, the drill will do the trick.

2

Post a reply to: 2005 YZ250 - Ship of Theseus

The Latest