2014 YZ450F suspension springs



45 replies to this topic
  • DaveJ

Posted September 11, 2013 - 02:50 PM

#1

If you took a KYB 5.9kg 50mm shock spring and stretched it out to 275mm, and took a KYB .51kg 48x470mm fork spring and stretched it out to 497mm, you would have yourself a set of 2014 YZ450F springs. Exactly. Perfect match. OD, ID, Wire, Coil count.

However, (and I think this goes without saying) you can't stretch a suspension spring. These were obviously rolled and then set.

When I heard that the springs were longer I was hoping for taller springs with more coils. Bummer.

Edited by DaveJ, September 12, 2013 - 08:13 AM.


  • grayracer513

Posted September 11, 2013 - 04:14 PM

#2

When I heard that the springs were longer I was hoping for taller springs with more coils.

 

But then you'd need fatter wire to get the same rate as the shorter spring.  Wouldn't take very much though, would it? 

 

The only advantage I can see to making the same length of wire into a longer spring as you've described is more coil clearance under extreme compression.  Has that been a problem that you've seen?

 

Good info, though, especially if someone were working up a budget based on swapping from their '10-'13.



  • DaveJ

Posted September 11, 2013 - 05:52 PM

#3

But then you'd need fatter wire to get the same rate as the shorter spring.  Wouldn't take very much though, would it?


Nope.

The only advantage I can see to making the same length of wire into a longer spring as you've described is more coil clearance under extreme compression.  Has that been a problem that you've seen?


If you were having a coil bind issue, then yes, this change would make sense. I was not aware of that as being a problem...but perhaps it was.

As for compression distortion, as long the the coil count remains the same, the distortion/deflection is the same.

Good info, though, especially if someone were working up a budget based on swapping from their '10-'13.


I'm not sure why, over the last 3 to 4 years, the manufactures have been going with higher rate springs. The very first YZ450s had .46/5.3 combination. Perhaps they are taking their spring advice from MXA.

  • WouldsAssassin

Posted September 11, 2013 - 06:06 PM

#4


I'm not sure why, over the last 3 to 4 years, the manufactures have been going with higher rate springs. 

 

 

 

The average rider is heavier. 



  • grayracer513

Posted September 11, 2013 - 10:14 PM

#5

Targeted marketing?   Hmmm...



  • Mutley53

Posted September 12, 2013 - 03:36 PM

#6

Anyone know where to get new springs for the 2014?  I weigh 165, so the stock springs are a bit stiff.  I don't think Yamaha is selling their lighter springs yet.



  • avocasingletrack

Posted September 12, 2013 - 03:45 PM

#7

I have a set of 48's with one ride on them

  • zeuszuki

Posted September 12, 2013 - 04:23 PM

#8

The average rider is heavier.

I'm not so sure, the rider weights being posted on here are comparable to here . I do recall reading an article stating than the Americans prefer firmer suspension than us Euro' riders . The stock spec' supports this.

What is everyone's thoughts on that ?

Edited by zeuszuki, September 12, 2013 - 04:26 PM.


  • Mutley53

Posted September 12, 2013 - 05:12 PM

#9

I have a set of 48's with one ride on them


Where did you get them from, what brand are they? They are the longer springs (497mm)?

  • avocasingletrack

Posted September 12, 2013 - 06:21 PM

#10

Where did you get them from, what brand are they? They are the longer springs (497mm)?

The bike had .44's , i was in between a 46 & 48 ...i tried the 48 and it was too much .  Threw in .46's and it was good.

They were in my '12 yz250 i sold this spring. I'd have to measure them tomorrow, idk the length. They are KYB .

I also have the .44's


Edited by avocasingletrack, September 12, 2013 - 06:38 PM.


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Mutley53

Posted September 12, 2013 - 07:14 PM

#11

The bike had .44's , i was in between a 46 & 48 ...i tried the 48 and it was too much . Threw in .46's and it was good.
They were in my '12 yz250 i sold this spring. I'd have to measure them tomorrow, idk the length. They are KYB .
I also have the .44's


Coming from a YZ250 they are likely 450mm. I believe the 2014 YZFs are the only bikes with 497mm springs.

  • avocasingletrack

Posted September 13, 2013 - 09:03 AM

#12

Coming from a YZ250 they are likely 450mm. I believe the 2014 YZFs are the only bikes with 497mm springs.

They measure 485 mm , they are KYB .48



  • Mutley53

Posted September 13, 2013 - 12:23 PM

#13

They measure 485 mm , they are KYB .48


I imagine they would work with some spacers. I'm going to hold off on springs until I get a few more hours on the bike. The only place I've seen that lists 497mm springs is Diverse Mfg.

  • Itsbroken

Posted September 13, 2013 - 01:26 PM

#14

Racetech has springs for the '14.

  • grayracer513

Posted September 13, 2013 - 02:09 PM

#15

KYB dealers will have no problem getting them, and KYB springs are a cut above the aftermarket stuff in terms of quality.  Not very much more expensive, either.

 

SMART Performance or Suspension Direct.



  • Itsbroken

Posted September 13, 2013 - 05:09 PM

#16

Well, I may retract the above. I order a couple different spring sets to play with. They are 24mm shorter than factory spec. Guess they are shipping '13 springs. Anybody know anything??

  • motoscotty

Posted September 13, 2013 - 08:33 PM

#17

Well, I may retract the above. I order a couple different spring sets to play with. They are 24mm shorter than factory spec. Guess they are shipping '13 springs. Anybody know anything??


The shock spring yes, that's what I'm running right now, is a shorter spring from a 13
As long as you don't run out of threads and if you do your spring is to soft.

The forks I have heard of people installing 30mm spacers and using the 13 springs.
KYB shows them available end of Sept.

  • Joe_Jet

Posted September 20, 2013 - 06:30 PM

#18

Is the stock shock spring on the 14 the same as the 06-09?



  • grayracer513

Posted September 20, 2013 - 08:51 PM

#19

No, larger diameter, like the '10-'13, but also longer than the '13



  • motoscotty

Posted September 29, 2013 - 08:36 AM

#20

Dave and I have been doing some testing on my shock at some of the local tracks and I found that going up a spring rate and running 110-112 sag really smoothed out the bike and it corners better. We started at 104 and were having problems getting the bike to settle entering turns and just generally out of balance.
I never would have guessed that in a million years, I have tested this on an outdoor style track that was miserably rough everywhere and the bike was far easier to ride.
Dave himself thought it work considerably better also.

Yesterday I rode at a fairgrounds style track and again started out at 104 again and it again was just not happening.
Adding a bit more we were again at 112 and even with the tight rutted 180 degree turns it turns soon much easier.
Never once did I feel like it compromised the front end traction.

This is the most comfortable I have felt on this bike yet!

I'm 200 lb vet int rider and running a 6.3 in the rear at 112 mm sag, fork tubes are 4mm above the clamp.





Related Content

Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.