Two Stroke Motocross

Two Stroke Motocross Forum => Technical => Topic started by: wysguy on July 04, 2011, 07:37:52 AM

Title: 07 YZ450F Suspension on a YZ250
Post by: wysguy on July 04, 2011, 07:37:52 AM

I have an "extra" 2007 YZ450F in the garage.  Are the forks/shock the same as my 2006 YZ250?  I want to get a set revalved and wanted something to ride in the interim.  Since I don't like riding the 450F, I would like to put the forks/shock on my YZ.

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: Coop on July 05, 2011, 07:56:10 AM

Well since you are planning to take the 250 suspension off for servicing, why not just do a little extra wrenching and try the 450 stuff? Best way to find out  :D .

Seriously someone here might know for sure...

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: wysguy on July 05, 2011, 02:22:08 PM

Quote from: Coop on July 05, 2011, 07:56:10 AM

Well since you are planning to take the 250 suspension off for servicing, why not just do a little extra wrenching and try the 450 stuff? Best way to find out  :D .

Seriously someone here might know for sure...

Well, it does fit, but I don't know how it will ride.  I have read that the valving is different, which was what I was assuming but was hoping someone would know a bit more specifically what is different.

I got lucky and the suspension shop (Pro-Action NC) is giving me a really quick turn around on my 250's kit so I will only be without a bike for a day or so.

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: riffraff on July 05, 2011, 08:25:27 PM

Can the shop revalve the 450f set to the 250 specs?

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: wysguy on July 06, 2011, 04:30:42 PM

I forgot to ask him.  I don't see why they can't, the physical dimensions are very close.

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: MyckMcClung on July 07, 2011, 08:11:31 AM

I would assume that the 450 would be a little stiffer due the extra crap it hauls :P

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: Kbiker on August 15, 2011, 05:33:49 PM

I'm pretty sure the 450 will have the newer style twin chamber forks. I think the 250 will have older tech internals. I love the twin chamber stuff, but I have always heard good reviews about the stock YZ250 stuff.

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: wysguy on August 16, 2011, 02:47:31 AM

They both have the SSS KYB forks.  At least 06 and newer, to my knowledge.

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: SachsGS on August 16, 2011, 05:52:39 AM

I recall reading an article in Motocross Action that stated that the latest 4T suspension is valved quite differently to deal with the way a 4T behaves in a corner (compression braking/high centre of gravity causing the front wheel to push).

Title: Re: 07 YZ450F Suspension on a YZ250
Post by: MXLord327 on August 18, 2011, 12:57:14 PM

Everything I have read says that the '06 to current YZ250 forks are about the best on the market.  As long as they are sprung for your weight, maybe a re-valve for your style and riding conditions, and you can't get much better.  Much more plush than the older models on my '98 YZ250!!!