450 FX Fork Seals

I've got the leaky fork syndrome and I'm trying to debate what to do.  I've heard they made some improvements to the fork for 2017 so I compared the part fiches and it looks like they changed two things.  1) a revised oil seal, and 2) they added what they call a scraper between the oil seal and the dust seal.

 

Should I get these items and do a rebuild or transition to something aftermarket like the SKF's?  I don't understand what makes these so different from the 450F forks from a seal perspective?

SKF

OEM blows.

Mine went out in hour 2

 

SKF or nothing

SKF it is. Looking at Rocky mountain they don't have a set for our bike but they do have some for the 250FX. I'm guessing they are the same?

I was wondering the same ^ I'm gonna order a set to have on hand do I just get seals or seals with bushing kit too ones 33 dollars and with bushing kit it's 97$?

I was wondering the same ^ I'm gonna order a set to have on hand do I just get seals or seals with bushing kit too ones 33 dollars and with bushing kit it's 97$?

That was going to be my same question.  Looks like RockyMountain has both the dust and oil seals for $66.  Or do I just go with the oil seal for $33?

I don't know... I've been running the same set of OEM KYB seals for so long now that I forgot when I installed them. 

 

The thing that most commonly kills fork seals is when you let mud dry on the lower tubes and ride it that way.  Even water spots can degrade them if they're gritty enough.  Keep them cleaned up between rides and they'll last much longer. 

SKF

I don't know... I've been running the same set of OEM KYB seals for so long now that I forgot when I installed them. 

 

The thing that most commonly kills fork seals is when you let mud dry on the lower tubes and ride it that way.  Even water spots can degrade them if they're gritty enough.  Keep them cleaned up between rides and they'll last much longer. 

 

This has been my experience, too.

 

After every ride and/or after washing the bike, wipe off the lower fork tubes and leave them spotlessly clean.

I use a paper towel with a bit of Bel-Ray 6-in-1 on it.

No trouble.

I've been pretty meticulous about cleaning my first-ever off the show room floor bike so I'm pretty sure that my fork seal failure is not related to that.

This has been my experience, too.

After every ride and/or after washing the bike, wipe off the lower fork tubes and leave them spotlessly clean.

I use a paper towel with a bit of Bel-Ray 6-in-1 on it.

No trouble.

I have 75hrs on my bike and so far so good. I do use motion pro fork bleeders and make sure there is no pressure transporting etc. Seems like a mixed results on this.

Improper suspension setup / transporting / storage can also lead to pre-mature seal failure. Something to think about.

I swear I read somewhere in the manual it states to grease up the lower fork tubes... maybe I had too many beers, but I have tried to find that info again with no luck. Anyone else heard of this? Team I raced for many years ago (12) used to spray something on them before our races.... but sadly, I never thought to ask what it was.

One of the tricks is to apply a little grease between the dust seal and the oil seal as a dirt interceptor for the stuff that gets past the dust seal.  Then you can periodically pull down the dust seals, clean out the old grease, run a business card around under the oil seal and re-grease.  This helps but it's not very effective against water or mud spots.

Resurrecting this thread...

Replaced the stock seals with some high dollar SKF ones and I'm not impressed.  After only about three rides one seal blew on me and the other has a small leak.  Upon further inspection there is a ton of "fine" grit that has gotten past the dust seal.  Perhaps the dust here in Utah is just overly rough on suspension?  I ride with a bunch of guys that have Hondas and KTM's and they don't seem to have any problems.  Pretty good at keeping my bike nice and clean too.

Does anyone have experience with the '17 parts?  They revised the oil seal and added a "scraper" between the dust and oil seals.  Wondering if I should give that a try.... Unfortunately when ordering from Rockymountain it's on backorder until August they told me :-( . Can't find anyone else online that has them in stock either...

Part numbers:

B29-23145-00-00

B29-4381D-00-00

14 minutes ago, blbills said:

Resurrecting this thread...

Replaced the stock seals with some high dollar SKF ones and I'm not impressed.  After only about three rides one seal blew on me and the other has a small leak.  Upon further inspection there is a ton of "fine" grit that has gotten past the dust seal.  Perhaps the dust here in Utah is just overly rough on suspension?  I ride with a bunch of guys that have Hondas and KTM's and they don't seem to have any problems.  Pretty good at keeping my bike nice and clean too.

Does anyone have experience with the '17 parts?  They revised the oil seal and added a "scraper" between the dust and oil seals.  Wondering if I should give that a try.... Unfortunately when ordering from Rockymountain it's on backorder until August they told me :-( . Can't find anyone else online that has them in stock either...

Part numbers:

B29-23145-00-00

B29-4381D-00-00

Bummer make sure you don't have any scratches in the chrome tubes when you put the new seals in. 

You should be able to get original type Japanese seals from Enzo, Racetech or others. 

I use to get a lot of leaking seals from scratches now I run the seal saver neoprene Velcro deals. 

Sub'd.  1 fork seal is leaking on my YZ250FX.

Local dealer says the SKF seals have a lot more drag and are just as prone to leak as the Yamaha seals.

Edited by MidlifeCrisisGuy
5 minutes ago, MidlifeCrisisGuy said:

Sub'd.  1 fork seal is leaking on my YZ250FX.

Local dealer says the SKF seals have a lot more drag and are just as prone to leak as the Yamaha seals.

I don't think they have a lot more drag. However I had a pair of Ohlins for my WR done with new SKF seals and they leaked in less than a year. That was on my Supermoto bike only ridden on the street. 

The entire point of the SKF seal is that it has LESS drag than the OEM seals, not that they seal better.  It really is splitting hairs, however, and I doubt there are 3 people on this board who could tell the difference in blind testing.

Nevertheless, the current KYB seal (Yamaha OEM is as good a seal as you're likely to get from anyone.  The single biggest killer of seals is mud left to dry on the fork tube. Even a fairly hefty water spot can do it.  It works up and down like a little file on the seals, and that's that.  If you ride in a muddy environment, wipe the tubes down between rides.

The second worst is mud in any form, wet or dry.  Then, just normal dirt.  Dirt builds up under the dust seal and works its way into the oil seal, preventing it from working.  You can very often clean it out, though.  Pull the dust seals down, clean out anything on the exposed face of the seal, then tear a business card or match book cover in half lengthwise and work it under the seal.  The "fuzzy" torn edge will pull down most all of the crud that gets up under them.  If you make this a regular practice along with keeping the tubes as clean as practicable, you'll have a lot less trouble.

like he said.. i've always had great luck with factory seals..they arent the cheapest seals out there but i've had great luck with em as well.

Put 60 hours on stock seals with zero leaks. Then replaced them with oem during a fork oil change. Zero leaks after 20 more hours.

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