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USD fork seals blown

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BillyJ
Nearly there...



Joined: 07 Jan 2013
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PostPosted: 23:30 - 03 Aug 2015    Post subject: USD fork seals blown Reply with quote
How much force is required to blow a seal.

My Ducati left side seal blew after either coming down from a wheelie or being used after sitting for a few years.

How easy is to to blow seals coming down from a wheelie

I don't want to blow them every time the wheel comes down.

Also is it true replacing seals on USD forks is a pain in the arse?
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Had: '06 CBR125R + '01 GSF600 + '07 SPRINT ST 1050 + '80 CB250 RSA + '93 Ducati 900SS
Have: '13 GSXR-1000 + '01 CB500S
"The aryan confuser"
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Just_James
Could Be A Chat Bot



Joined: 29 Aug 2014
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PostPosted: 23:57 - 03 Aug 2015    Post subject: Re: USD fork seals blown Reply with quote
BillyJ wrote:
How much force is required to blow a seal



Navy or animal?


My sincere apologies, couldn't resist Sad
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Current Bikes / Projects: 1999 Rieju RS1 50
Previous bikes - 1986 DT125R (field bike), 1989 KX250, 1980 KX420 (with 500cc big bore), 1992 YZ250, 1988 KX500, 1989 XR250R, 1988 VFR400R NC24, 1999 Cagiva Mito 125, 2008 Rieju RS2 50 , 1993 Honda NSR 125
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b422063
Crazy Courier



Joined: 14 Oct 2014
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PostPosted: 05:31 - 04 Aug 2015    Post subject: Reply with quote
Stop crashing your wheelies down then and accelerate into them as the front wheel comes down. If you want to do wheelies; accept you'll not get them 100% right 100% of the time and you'll have to replace your wheel bearings, headstock bearings, chain & sprockets and fork seals more often.

Yes it's true replacing the seals is a pain in the arse, but these things are all relative.
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P.addy
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 09:23 - 04 Aug 2015    Post subject: Reply with quote
A 900SS doesn't seem like the wheelie bike of choice.

Fix the seals and give it some stick when it comes down, just open the throttle more.
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BillyJ
Nearly there...



Joined: 07 Jan 2013
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PostPosted: 09:54 - 04 Aug 2015    Post subject: Reply with quote
Ok good advice, most of those wheelies are tiny, not on purpose and just due to heavy acceleration.

The biggest bike I was on before this was a Bandit 600 Laughing Laughing
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Had: '06 CBR125R + '01 GSF600 + '07 SPRINT ST 1050 + '80 CB250 RSA + '93 Ducati 900SS
Have: '13 GSXR-1000 + '01 CB500S
"The aryan confuser"
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 10:05 - 04 Aug 2015    Post subject: Reply with quote
BillyJ wrote:
Ok good advice, most of those wheelies are tiny, not on purpose and just due to heavy acceleration.

The biggest bike I was on before this was a Bandit 600 Laughing Laughing


Which probably had more power than the 900ss. Wheelies especially small ones don't tend to blow out seals. I've been badly wheeling my TDM for years and never blown out a seal.
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davebike
World Chat Champion



Joined: 15 Nov 2013
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PostPosted: 10:11 - 04 Aug 2015    Post subject: Reply with quote
From Workshop experience upside down forks blow at least twice as often as conversational forks

No that easy to do either Look at Manuel before starting some need Odd tools and you need a split seal driver or to be VERY carefully with a drift
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BillyJ
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Joined: 07 Jan 2013
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PostPosted: 10:13 - 04 Aug 2015    Post subject: Reply with quote
chris-red wrote:


Which probably had more power than the 900ss. Wheelies especially small ones don't tend to blow out seals. I've been badly wheeling my TDM for years and never blown out a seal.


Believe me the 900ss is faster/easier to wheelie then the bandit.

And about the seals, that's why I mentioned that the bike sat for several years before being ridden, as I suspected that would of contributed to their early failure.
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Had: '06 CBR125R + '01 GSF600 + '07 SPRINT ST 1050 + '80 CB250 RSA + '93 Ducati 900SS
Have: '13 GSXR-1000 + '01 CB500S
"The aryan confuser"
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BillyJ
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Joined: 07 Jan 2013
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PostPosted: 10:24 - 04 Aug 2015    Post subject: Reply with quote
Is it possible to just

remove the fork top bolt
empty old oil
change seals
refill with oil
refit top bolt


Do I need to fully dissemble the fork?
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Had: '06 CBR125R + '01 GSF600 + '07 SPRINT ST 1050 + '80 CB250 RSA + '93 Ducati 900SS
Have: '13 GSXR-1000 + '01 CB500S
"The aryan confuser"
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lihp
World Chat Champion



Joined: 22 Sep 2010
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PostPosted: 10:29 - 04 Aug 2015    Post subject: Reply with quote
With USD forks, the oil seal is the first to go on, so the last to come off. It also needs to come off the top.

The fork needs to be seperated to do so. You will need tools to hold the damping rod, and you will need a fork compressor too.

It is far, far less hassle. To take the fork off, take it to your local motorcycle repair shop, and ask them to change the seals on it and give them £30
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 10:42 - 04 Aug 2015    Post subject: Reply with quote
BillyJ wrote:
chris-red wrote:


Which probably had more power than the 900ss. Wheelies especially small ones don't tend to blow out seals. I've been badly wheeling my TDM for years and never blown out a seal.


Believe me the 900ss is faster/easier to wheelie then the bandit.

And about the seals, that's why I mentioned that the bike sat for several years before being ridden, as I suspected that would of contributed to their early failure.


I've ridden both and would put it the other way personally, however my memory is foggy. Can't speak to the wheeling as the 900ss wasn't mine so I didn't try!
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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CaNsA
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Joined: 02 Jan 2008
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PostPosted: 13:16 - 04 Aug 2015    Post subject: Reply with quote
BillyJ wrote:
Do I need to fully dissemble the fork?


Yes, and get some ratchet straps so you can compress everything and fit the top cap.

It took 30st to fully compress my USD zxr400 forks.
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 13:24 - 04 Aug 2015    Post subject: Reply with quote
CaNsA wrote:
BillyJ wrote:
Do I need to fully dissemble the fork?


Yes, and get some ratchet straps so you can compress everything and fit the top cap.

It took 30st to fully compress my USD zxr400 forks.


Any particular reason? I've had the forks apart on more bikes than I care to remember and I've ALWAYS managed to do it by hand.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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CaNsA
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Joined: 02 Jan 2008
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PostPosted: 13:47 - 04 Aug 2015    Post subject: Reply with quote
chris-red wrote:
I've had the forks apart on more bikes than I care to remember and I've ALWAYS managed to do it by hand.


USD forks?

Ya big fatty ya.
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 13:52 - 04 Aug 2015    Post subject: Reply with quote
CaNsA wrote:
chris-red wrote:
I've had the forks apart on more bikes than I care to remember and I've ALWAYS managed to do it by hand.


USD forks?

Ya big fatty ya.


Only one set on my EXC 520, went back together no problem. On my GS500 I even screwed it back on with the weight of the bike on it (Pikey Spring/oil change)

I thought you northerners were supposed to be hard grafters? Sound more like puny children Wink
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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