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2016/2017 WR450F spring rates and valving

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Thank! But isn't that the FX valve spec? I thought the WR was supposed to be even softer.

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That is the WR spec.  Here is the FX spec sheet.  FWIW, my 450FX had 18 compression face shims, not 16.

450FX <a href='https://thumpertalk.com/link/click/1299/' rel='nofollow' data-ipsHover-target='https://thumpertalk.com/index.php?app=autolink&module=links&controller=content&id=1299' data-ipsHover target='_blank' rel='noopener' data-autoLink>kyb</a> spec sheet.png

Edited by MidlifeCrisisGuy

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Got it. Very subtle differences. I can see why I thought it was the FX spec. Thanks again.

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Great info MidlifeCrisisGuy!

Any chance you have the 2016 WR250F valve specs as well?

Thanks!!

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Hey, Knowlegable Ones. 

Any idea what the OEM spring rate is for the small pressure springs in the base valve? 2016 WR450F  

Cheers, Gaz. 

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22 minutes ago, Ghazzah said:

Hey, Knowlegable Ones. 

Any idea what the OEM spring rate is for the small pressure springs in the base valve? 2016 WR450F  

Cheers, Gaz. 

As most 2014+ YZ450F's, a .pdf version I have of KYB parts catalog shows the 2015- WR450F

to have 22N (Newton) ICS springs (which equals about 2.2kg/mm), 2016+ are likely unchanged

Edited by mlatour
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Thanks, mlatour. Very useful info. I have ordered some softer ICS springs to take the edge of square-edged bumps, reduce deflection etc. 2.2kg is a pretty strong spring, no wonder my humble riding ability is struggling with this area of the fork's performance. 8^)-

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Hey, Team. Just finished pulling my '16 WR450 down for a re-valve, re-spring, shock-linkage and wheel bearing maintenance. I can confirm that the NZ/Australian spec forks have exactly the same shim stacks as detailed in MLCG's tables above. I am yet to pull the shock down but will double check shim specs when I do. RT gold valve going into the shock. 

I'm dropping to 4.2kg/mm FRSPs (from 4.6kg/mm OEM) with super-light 1.0kg/mm Pressure Springs and valving (RT Gold Valves C&R) for 'An Old Guy Wobbling Slowly Along Single Trails'. Yamalink Trail fitted (Yes, I am a Skinny Hobbit at 165lb/75kg, 5'7"/172cm) with a 6.1kg/mm Factory Connection spring (effectively a 5.3kg/mm (down from 5.7kg/mm OEM) factoring in the 15% leverage 'softening' due to the YL. I fitted 1.0kg/mm pressure springs to my old '15 YX250FX and they made a heck of a difference. Virtually eliminated all of the deflection issues that were going on, especially through rock gardens etc. 

Spring rates front and rear softened by approx 8-10% to get my race sag perfect. Even when loaded with gear, the OEM springs were too stiff for good sag levels. I clearly need to eat more burgers. I'm running standard oil levels at the moment, but will probably drop the fork's main chamber level by 5mm-10mm when I reassemble. Using Yamaha S1 suspension fluid for the forks (around 15 cSt @ 40 degrees Cel.) 

I'd be interested to hear anyone's opinion about my proposed suspension mods. Always open minded. 

Cheers, Gazza. 8^)-

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