Leaking Fork Seal....Again - Page 2 - Ducati.ms - The Ultimate Ducati Forum
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post #11 of 30 (permalink) Old Jun 16th, 2019, 4:26 pm
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Iíve already experienced two leaking fork seals in 24K miles.

2014 Red MTS ST, 2006 Yamaha FZ6
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post #12 of 30 (permalink) Old Jun 23rd, 2019, 12:36 pm Thread Starter
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I took my fork apart, and while inspecting for damage I found a small mark on the front of the slider. It's on the part of the tube that would normally be exposed and is about 3/16" long. Looks like a piece of lint and I can't feel it. I can't imagine that it could damage a seal, but I don't see anything else that might cause failure. Should I install the new seal and cross my fingers, or is there something I should do to the tube before reassembly? Thanks.

2006 ST3s ABS, 1991 Suzuki GSX-R750
2000 Yamaha WR400, 2003 Honda TRX300ex
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post #13 of 30 (permalink) Old Jun 23rd, 2019, 6:26 pm
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I took my fork apart, and while inspecting for damage I found a small mark on the front of the slider. It's on the part of the tube that would normally be exposed and is about 3/16" long. Looks like a piece of lint and I can't feel it. I can't imagine that it could damage a seal, but I don't see anything else that might cause failure. Should I install the new seal and cross my fingers, or is there something I should do to the tube before reassembly? Thanks.
Maybe it was just the lint, or whatever debris it was, that caused the leak. I've never used one of these tools, but some say they are great. I guess it's possible to have grunge get in there and cause a leak but not damage the seal.

https://www.amazon.com/Squatch-Racin...a-743371815774

It you're comfortable trying get some high grit, 2000 or more, wet dry paper and use it with oil to buff the area of the slider you think may have an imperfection. I buffed the shaft of my 916 shock when I rebuilt it. Came out fine. Didn't go crazy with it, just a polish.

Dan. "Painfully mistaking my big talk for the truth" Samantha Fish.
2003 ST4s (The Truck)
1995 916 (Junk Yard Dog)
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post #14 of 30 (permalink) Old Jun 24th, 2019, 7:26 am Thread Starter
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Maybe it was just the lint, or whatever debris it was, that caused the leak. I've never used one of these tools, but some say they are great. I guess it's possible to have grunge get in there and cause a leak but not damage the seal.

https://www.amazon.com/Squatch-Racin...a-743371815774

It you're comfortable trying get some high grit, 2000 or more, wet dry paper and use it with oil to buff the area of the slider you think may have an imperfection. I buffed the shaft of my 916 shock when I rebuilt it. Came out fine. Didn't go crazy with it, just a polish.
I've got one of those tools for my dirt bike, but have never had any luck saving a seal with it. Anyway, the seal on my ST was clean, so that's not likely the problem. I was thinking about polishing the nick like you mentioned, but I'm concerned about damaging the TiN coating. Should I be concerned?

Thanks for the quick response.

2006 ST3s ABS, 1991 Suzuki GSX-R750
2000 Yamaha WR400, 2003 Honda TRX300ex
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post #15 of 30 (permalink) Old Jun 24th, 2019, 7:42 am
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If you canít feel it with a fingernail I wouldnít worry about it. Even 2000 grit will dull the TIN coating, so 1) keep the polished are very small and precise , or 2) polish the whole visible portion so the finish is the same. I think Iíd opt for #1, but donít do anything at all if you canít feel it with a fingernail. TIN is very hard and very thin.

'96 Ducati SS900CR, '07 S4RS, '06 Busa, '77 Bonny,
'00 Superglide, '85 Sportster, '78 SR500
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post #16 of 30 (permalink) Old Jun 24th, 2019, 7:47 am
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Iíve never had any luck with the SealMate either. It seems like I can never get it all the way around without hanging up on something. I used AllBalls seals in two bikes last winter before this discussion started, so far so good.

'96 Ducati SS900CR, '07 S4RS, '06 Busa, '77 Bonny,
'00 Superglide, '85 Sportster, '78 SR500
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post #17 of 30 (permalink) Old Jun 24th, 2019, 9:01 am
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Seal saver

I have had 100% success with seal saver. Haven't changed a seal in many years.

98 ST2, 07 ST1300, 92 R100RS
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post #18 of 30 (permalink) Old Jun 24th, 2019, 3:10 pm
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I'm concerned about damaging the TiN coating. Should I be concerned?
That I do not know. THe shock I've polished was standard chrome. I will say that the TiN coating of my ST4s is pretty much gone in the area that receives the most contact with the bushing and seal. Chrome underneath. Not sure it's really that big of a deal.

Dan. "Painfully mistaking my big talk for the truth" Samantha Fish.
2003 ST4s (The Truck)
1995 916 (Junk Yard Dog)
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post #19 of 30 (permalink) Old Jun 24th, 2019, 5:15 pm
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i have only done 2 so far on dual sport bikes, kl250 super sherpa & drz 400e. both successful with much usage. i went with oem dirt n oil seals because a few others were having quality issues with after market brands. the parts were negligible compared to the effort of a potential redo. i recall using saran wrap to make sure seals were not knicked during install.

evolution suspension in San Jose did my tiger 1050. i supplied oem seals. they pointed out some pits on one fork to keep an eye on, but 10k miles later, no leaks.

some thoughts, have an experienced person review or watch your process. my gut tells me it's the quality of seals you have.

2006 ST3s
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post #20 of 30 (permalink) Old Jun 24th, 2019, 9:28 pm Thread Starter
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I am SO confused! I think the correct dimensions for my fork seals are 42x54x11. That's what the listing for the Athena seals I'm installing indicated, but they sent me 43x55x11 seals. They don't fit.

So I went back and looked at the invoice for the Moose Racing seal I just removed, and it says 43x54x11. I double checked the MotoWheels website, and 43x54x11 is what they call for. If it's actually supposed to be a 42 ID, that would explain the leak.

I've asked for a refund or exchange from the Athena vendor, but I'd like to make sure I get the right size this time. Can anyone verify if 42x54x11 is correct?

2006 ST3s ABS, 1991 Suzuki GSX-R750
2000 Yamaha WR400, 2003 Honda TRX300ex

Last edited by twerth; Jun 24th, 2019 at 9:37 pm.
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