YZ250 Swingarm Update the Right Way (Not the MXA way)

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5/22/2018 5:20 PM

thereal87 wrote:

Hey billy, just to 100% confirm it before I lay out cash on these parts, I should track down 09 yzf swingarm, linkages (pull ...more

That should do it. I used a 2009 450 swingarm and 2009 250F complete linkage which all bolted right up. But I'm sure other slight variants of that will bolt right up as well. As Zesiger mentioned the 450 swing arm is a bit longer than the 250, by 5mm I think.

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Billy Wight
Luxon MX
@LuxonMX
https://luxonmx.com
Motocross Components Engineered for Performance

5/22/2018 7:23 PM
Edited Date/Time: 5/22/2018 7:25 PM

thereal87 wrote:

Yamaha fx and wrf run their own swingarm, it looks the same as the yzf swingarm but runs the small axel like the yz 2 strokes ...more

If you look you'll find that the FX and standard F run the same arm, according to the part numbers.

Since the FX runs the smaller axle I bought an FX arm to verify this, even though the parts numbers were the same, and they are the same. It will also accept the larger F axle. There is no difference in the arms.

The FX runs the same rear wheel and axle that comes on the 250X, which is the same as the standard YZ, but with an 18" rim.

So the axle blocks are carrying the load. The hole in the swingarm has nothing to do with it.

I run both the large axle wheels and small axle wheels on my YZ with the F swingarm swap without any issues.

I have a sleeve that I use in the larger brake carrier hole when running the smaller axle, so I don't have to swap brakes.

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6/2/2018 9:31 AM

I am in the process of rebuilding my 2012 YZ 250 and found a complete Linkage with new bearings off a 2009 yz250F on ebay.

The part numbers are different for the linkage as well as the connecting rod.

does anyone know if the linkage will bot onto my bike or does it only work if i install a 250f swingarm too?

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6/2/2018 12:43 PM

mnomis484 wrote:

I am in the process of rebuilding my 2012 YZ 250 and found a complete Linkage with new bearings off a 2009 yz250F on ebay.

...more

That should work fine. I believe I used an 09 450 swingarm with 09 250f linkage assembly and it all bolted up without issue. Pretty sure the only difference between the 250f and 450 swingarm is the 250f is a slightly shorted length.

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Billy Wight
Luxon MX
@LuxonMX
https://luxonmx.com
Motocross Components Engineered for Performance

6/2/2018 12:58 PM
Edited Date/Time: 6/2/2018 12:59 PM

Thanks for the quick reply!

I understand now, i just wasnt sure if the 250f linkage would fit my 2 stroke swingarm wink

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6/2/2018 1:01 PM

mnomis484 wrote:

Thanks for the quick reply!

I understand now, i just wasnt sure if the 250f linkage would fit my 2 stroke swingarm wink

Oh, I didn't catch that you wanted to use it in your two stroke swingarm! Definitely don't do that, it will throw off the suspension curve a bunch. That linkage should work fine as long as you're also changing to the four stroke swingarm. But using that linkage on a two stroke swingarm isn't a good idea.

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Billy Wight
Luxon MX
@LuxonMX
https://luxonmx.com
Motocross Components Engineered for Performance

6/2/2018 10:33 PM
Edited Date/Time: 6/2/2018 10:34 PM

im running 09 yz250f rear end on my 06

swingarm
linkage
brake carrier
rear hub.
bolted right on,

works great settles into corners a bit better, other than that i dont notice anything really Photo.


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8/18/2018 6:00 PM

Does anybody know if a wr450f 2016 motor will go into a 2016 yz250F frame? Is there any fab or additional parts required like the above mentioned?

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5/15/2019 6:34 AM

JM485 wrote:

Well, after finally getting this swap figured out once and for all, I figured I would share how I went about putting the ...more

Not sure why you would be blaming MXA for your stuff up, if you read it you would see in the article they say to use a 2009 450 swingarm, they also say the 2014 Yzf shock is off center..

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7/6/2019 3:52 PM

adam8781 wrote:

im running 09 yz250f rear end on my 06

swingarm
linkage
brake carrier
rear hub.
bolted right on,

works great settles into ...more

Bringing this thread back from the dead... Did you use the 2009 yz250f linkage arm and linkage knuckle? Did you use the yz250 2 stroke shock as well?

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7/7/2019 12:54 PM

My $.02
I used the 2010 arm & linkage with my original 2stroke shock. All bolted up fine. I even used the yzf 17mm pivot bolt bc I forgot to swap out my 18mm swingarm bushings. Once I tighten it down there was no play however I am still going to either make a 1mm bushing for the frame or swap out the swingarm bushings. 😎
Weight loss was 1.35 lbs. I thought it was more but I will still take the unsprung savings!
As for how it rides, I like it. Feels a little more planted & settled in corners. I ride a tiny bit less sag on it now (102 vs 105) bc the yzf linkage is slightly softer in the beginning stroke & I felt it needed a little more bite on the front. That being said I may go back to 105 when I mount my 22mm triple clamps though.
Overall if I was an “A” or faster rider with my stock setup already dialed in would I do it, no, not worth the $$$. That being said I got a good deal on the package & I wanted the weight savings so I went for it. Glad I did 😁

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2/12/2020 9:19 PM

AHarmon237 wrote:

Bringing this thread back from the dead... Did you use the 2009 yz250f linkage arm and linkage knuckle? Did you use the yz250 ...more

yz250 shock, 09 yz250f swingarm, linkage, rear hub, rear brake carrier.

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2/13/2020 10:22 AM

All you really need is the newer swingarm and linkage and use the yz250fx wheel spacers. I used 09 parts so i didn't have to make a spacer because of the later models being off set.

If you want more weight savings you go with the later model rear hub axle and brake caliper carrier and chain adjuster blocks.

But the yz250fx and wr's that use the newer swingarm use the same exact rear hub and axle and chain adjuster blocks as the yz's. I got the yz250fx wheel spacers because I have the older style from my 06. But if you look at the yz parts diagram on the newer models. You'll see that the yz's part number for the wheel spacers has changed to the yz250fx part number.

The only difference in the yz's rear wheel vs the yz250fx and wr's is the yz has a 19 inch rim vs 18 and the corresponding different spokes. Uses same axle and chain adjuster blocks as the yz's same hub everything.

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2/13/2020 11:28 AM

I’ve swapped some swing arms on CR’s and CRF’s. The length of the swing arm makes no difference if you are running stock gearing and a stock length chain. With stock gearing and stock length chain the wheel is gonna be where the wheel is gonna be when the chain is adjusted. Of course you can run a longer chain to move the wheel further back.

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10/4/2020 10:45 AM

Rear Axle Issues? Anyone have an issue with the rear axle not seeming to get tight? Running a YZ450F swingarm, 18 YZ450F brake carrier (25mm), Tusk Impact wheel with YZ450F spacers (25mm) and YZ450F axle blocks.

Torqued axle to 90ftlbs and you can slide the axle forward and backwards.

Almost seems like there is not enough threads on the axle or a spacer missing?

With no load on the axle there is about 2-3mm of space between the wheel assembly between the swingarm.

Thoughts

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10/4/2020 2:05 PM

Is there a washer under the nut?

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10/4/2020 3:54 PM

cdoggy81 wrote:

Is there a washer under the nut?

Ditto. I thought the same thing. A washer would/should make up enough to tighten things down. Also, I was putting my smoker back together the other night, and am still shocked at how high the torque values are for the axles. I tend to go with a bit less.... but if you are cranking 90lbs to the nut and there is still play, something is no-bueno!

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10/4/2020 9:43 PM

Mmmmmmmay be read a little closer.....
Photo

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10/5/2020 4:48 PM

What was he to read closer?

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10/5/2020 4:51 PM

That it defines in the article that the parts to use off an 09, and that when the reverse engine came into play, the linkage shifted positions, I know the rising rate was discussed, and not overly defending mxa, but it’s stated that the linkage position doesn’t align

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10/5/2020 4:52 PM

Iv just drooled over this swap for a long time, and i have read multiple threads from a few sites, stating the issues in fitment is all

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10/5/2020 5:26 PM

Since this was such an old thread I thought you were specifically referring to what Wycked31 had posted.

It is a straight forward swap. 09 yz450f or 09-13 yz250f swingarm, corresponding linkage, any 09+ rear wheel, spacers, axle & brake carrier & you are good to go.

If anyone wants to do one on their smoker I have a spare 450f swingarm.

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10/5/2020 5:28 PM

Lol, spare kicking around, lucky fella, I did get the feeling the yz250f from 10-13 would possibly work without issue, due to the traditional engine design

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10/5/2020 8:21 PM

Bingo 😉👍🏻
Once they flipped the engine that is where the offset came into play.

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10/6/2020 4:39 AM

Figured out the issue last night. It is an alignment issue. The brake carrier (18-YZ450F) required a 2mm spacer between the swingarm and the carrier.

Note I’m working with a 03 YZ250 frame and I am pretty sure a 09 YZ450F swingarm.

Once I set everything in place and measured the gap between the swingarm I noticed when tighten the axle it was causing the carrier to get cocked. I made a test shim (2mm) slide between the brake carrier and the swingarm is the carrier would seat correctly. Then the axle and everything torqued properly.

Now off the a to machine shop to have carrier modified.

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10/6/2020 4:41 AM

15tc150 wrote:

Mmmmmmmay be read a little closer.....
Photo

I am using a tusk rear wheel with the YZ450F spacers. See my comments below

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10/6/2020 7:38 AM

That’s good you figured it out. Can you post some pics of the gaps / alignment issues / etc?
Thanks 👍🏻

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10/6/2020 8:56 AM

New one on me. I've never seen a space there on any of the Yamaha's.

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10/6/2020 9:53 AM

cdoggy81 wrote:

That’s good you figured it out. Can you post some pics of the gaps / alignment issues / etc?
Thanks

See the pictures.

When you tighten the axle the carrier does not sit flush against the swingarm. I was able to move the rear wheel forward/backward. Once I put my test shim of 2mm in the gap the wheel torqued fine. Not sure if the Tusk hub is narrower then the stock YZ hubs but there is an alignment issue without the shim.

I’m having a machine shop recess a shim into the right side of the carrier to take up that space.

Photo
Photo

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10/6/2020 9:55 AM

Anyone have a 09 or newer YZ450F rear wheel they want to sell? I will test that to see if anything changes.

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