Yz Update

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8/11/2018 6:25 AM

The 450f is 5mm longer than the 250f swingarm from what I remember. I do not recall how much longer the 450f is over the 250 2 stroke arms though.
Everyone who does the swap can feel an improvement in handling plus you save over a few lbs bc you have to use the newer hub & axle smile

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8/11/2018 12:09 PM

cdoggy81 wrote:

Good info here as I’m doing the 22mm triple clamps conversion as well. Thought the 250f/450f would slide right into my YZ250 ...more

You press it out from the top. It's going to take quite a press, a simple arbor press probably won't do it. We use a hydraulic press, and you have to make sure it's well supported near the stem or you'll ruin the clamp. The OEM Yamaha press fit is absurdly tight, so be careful.

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

8/11/2018 12:13 PM

Mx746 wrote:

Is the 450 swingarm longer than the 250's? Id consider the swap to my 14 250 if there is a benefit other than a pound weight ...more

The 450 is 5mm longer. I've measured all 3 bikes side by side and it's nothing noticeable.
Keep in mind that the only way you can take advantage of the 5mm of length is if you keep your chain pulled all the way out. Which is impossible to do without changing your chain every ride.
So really 250 or 450 will give you the same result. And for some reason there are more 250 swingarm as for sale tha 450.

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8/11/2018 9:48 PM

So if you set the clamp in a press like it looks when mounted on a bike you press it out from the top where the threads are down through the bottom correct?

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8/12/2018 1:20 AM

cdoggy81 wrote:

So if you set the clamp in a press like it looks when mounted on a bike you press it out from the top where the threads are ...more

yes

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8/12/2018 10:49 PM

Thanks guys smile

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8/13/2018 11:05 AM

cdoggy81 wrote:

So if you set the clamp in a press like it looks when mounted on a bike you press it out from the top where the threads are ...more

Yes, like this:

Photo

Note the aluminum chunk supporting the clamp near the stem (it has a hole in it for the stem the fall through). This is really important, do not support it by the outer tube clamps!

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

8/13/2018 11:17 AM

Awesome! Perfect example pic!
If I wasn’t in FL & shipping costs be a ton, I would mail you mine & pay you to do it smile

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