Rockymountainatvmc.com - Dirt bike & ATV parts


YZ250F

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Nov 28, 1999
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#1
I was unable to E-mail MX-TECH from your ad so I would like to know you recommendations for suspension setup for a 185 lb rider in the roots/mud and some rocks in PA woods on a new 250F. I haven't ridden it yet, but assume that it will not be right for these conditions.
 
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Dec 2, 2000
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#2
I'm in the same situation. I also have a 250F and will be racing Harescrambles in NJ,PA,MD,NY. I need some suggestions on how to setup my suspension. I do not want to send it out to be worked on. I am 185lbs and I have rode the bike twice and it is very stiff. I know that it needs to be broken in for awhile, but it will still be to stiff. Any help would be great
 

Ham

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#3
Originally posted by motomad32:
I am 185lbs and I have rode the bike twice and it is very stiff. I know that it needs to be broken in for awhile, but it will still be to stiff. Any help would be great
People say that the difference between new and broken in is night and day, so give it a few more rides.

Ham
 

Jeremy Wilkey

Owner, MX-Tech
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#5
If you guys are doing tight rcky woods it's posible stock springs are ok. What do your sag numbers indicate.

Anyway the componets on your bikes do break in but it is a minimal impacting variable.

Try running tbings softer but the bike was set-up for the average motohead....

Regards,
Jer
 
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#6
Thanks for the help. I was hoping that you would say that we didn't have to change springs for the rocks because of our weight.
 
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#7
Jeremy,
With the sag set at 100mm, I'm getting 20mm of static sag. Should this be 25 to 30mm? Is it time for more spring?
 
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Aug 18, 1999
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#9
Jer, what about the midvalve on the YZF 250?

Does it have one? I heard someone talking about the YZF's and saying that he removed the shims from the midvalve and that allowed the oil to move easier and he was able to use more of the suspension. He said that it was a good mod for Enduro/HS riders.

According to him the mid-valve helps racers who have large g-outs and a lot of whoops like on an SX track or something.
 

Jeremy Wilkey

Owner, MX-Tech
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#10
Ivan,
ALL KYB 32125 (YZ) have midvalves.. They have been changed to float more than the 2000 which will make them less streesed and more likely to survive the ravages of time. However they are less effective which is bad. IMO removing the mid-valve is the bigest hack thing you can do... It proves you don't know what your doing..

The midvalve is tunable and some aplications need more or less but never none... It gives you midspeed compression, therby you don't have to make the base-valve as stiff fro low speed control and highspeed reponce..

Now before I get jumped on here I speak from exsperience on this issue.. Yes I am a mid-valve remover survivior
I have been free of mid-valve removal since I figured out how forks work..... LOL

Regards,
Jer
 
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#11
So with a mid-valve what would work best for a combination type rider. In general terms would someone who rides 50/50 MX and woods benefit more from a change in the shims of the mid-valve or the bottom shims? More bottom and less mid-valve or some other type of combo?

Don't worry, you are still getting my forks when I get the $$ up but I am trying to learn a little
 

Jeremy Wilkey

Owner, MX-Tech
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#12
Ivan,
First you don't have to applogize for that question.. I will answer it wether I'm getting them or RT or someone far worse for that matter...

Now IF I where doing a set of YZ forks for your condtions I would

1.) Make them work sooner.... (Speed Range)
2.) Make them work more.... (Coeficent increase) (allows me more latitude with the high speed compression, and low speed on the base valve..) (If you rob from petter you had better pay paul for something better..LOL)
3.) Looking at the big picture let me reiterate.. ALL these systems work in unison in terms of the ride qulaity and independelty
in terms of componets. I think the wisest plan is to exaim them as componets and make changes that will provide the best combination in terms of overall performance.

IE The KX has a mid-valve a little firm evenb for my tastes, The YZ has a stock mid-valve so soft i wonder why they even bothered putting it in.. However these forks still don't have a (borrowing from Mendalavin Genitcs)phenotype that would be so obvoius.. This illistrates the importance of the sytem set-up...


Regards,
Jer
 
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#13
The biggest surprise here is that I actually understand what you are saying. Not to a point where I could repeat it with any sense of intelligence


Thanks Jer.
 

Ham

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#14
Jer-
Does that mean that the solution to the harshness of my '00 YZ 125 is to firm up the mid-valve? Then you could increase intitial plushness? Or am I completely wrong?

Ham
 

Vic

***** freak.
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#15
Originally posted by Jeremy:

"The KX has a mid-valve a little firm evenb for my tastes, The YZ has a stock mid-valve so soft i wonder why they even bothered putting it in."

Jeremy- I'm confused. Did you mix up your KXs and YZs?
 
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