Author Topic: Question about "leak-proof" fork seals  (Read 2680 times)

0 Members and 1 Guest are viewing this topic.

Offline Frankencake

  • Yesssssss,
  • Master
  • *****
  • Posts: 1,847
  • "I like the old junk"
Question about "leak-proof" fork seals
« on: May 26, 2010, 06:02:21 PM »
Do they live up the their name?  I have never used them on the advice of an old timer.  As a rule of thumb, I usually don't go against the word of an old timer, but lately I have been thinking outside the box.  I like to avoid the "believe me now or believe me later" speech (I love saying that to people just to watch them squirm) especially when I have to say it to myself. 
What are the thoughts on these seals?
"Sure, if you don't want that bike in your backyard, I guess I'll take it."  "I'll probably just scrap it......"

Frankencake:  Brotherhood of the unemployed?  What's our secret handshake?

333:  Think "Shakeweight".

Offline BobbyR

  • Really Old Timer ...
  • *******
  • Posts: 12,367
  • Proud Owner of the Babe Thread & Dirty Old Man
Re: Question about "leak-proof" fork seals
« Reply #1 on: May 26, 2010, 06:16:55 PM »
When my 78K sprung a leak I put in a set of those and they lied. I got 3 year put of them, I polished the tubes etc and they first started putting rings on the forks and finally leaked. I put in a set of OEM Hondas 3 years ago and no rings no leaks. Some may have had better luck than I , but I hate doing things twice. 
Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline vanillagorilla

  • When did I become a
  • Hot Shot
  • ***
  • Posts: 710
    • The ole Facebook Profile...
Re: Question about "leak-proof" fork seals
« Reply #2 on: May 26, 2010, 06:21:21 PM »
I had issues with those seals @ a shop I worked at in Phx. Boss kept looking @ us like we weren't doing the job right... New supplier, no more leaks...
1978 CB750K 1976 Z1 2 Trail 90s

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,938
Re: Question about "leak-proof" fork seals
« Reply #3 on: May 26, 2010, 07:38:46 PM »
Leak proof seals worked for me - 8 years and 40,000 miles cant be too bad  ;). However nothing is ever leak proof so dont expect miracles  ;D
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline MCRider

  • Such is the life of a
  • Really Old Timer ...
  • *******
  • Posts: 14,376
  • Today's Lesson: One good turn deserves another.
Re: Question about "leak-proof" fork seals
« Reply #4 on: May 27, 2010, 09:00:18 AM »
Leak proof seals worked for me - 8 years and 40,000 miles cant be too bad  ;). However nothing is ever leak proof so dont expect miracles  ;D
My experience likewise good. But I used airforks, which these seals are up to, and the air does seal up the seals more than without.

Advantages: push fit, no driving them in. Lifetime guarantee. Less stiction.

Does a company stay in business 35 years selling crap continuously?

Often a "bad batch" serves to give an undeserved reputation to an otherwise good product.

OCICBW  YMMV
« Last Edit: May 27, 2010, 09:05:11 AM by MCRider »
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline the architect

  • Hot Shot
  • ***
  • Posts: 424
Re: Question about "leak-proof" fork seals
« Reply #5 on: May 28, 2010, 05:51:32 AM »
I had total crap luck with Leak Proof's Pro-Moly fork seals.  After spending so much time and effort on my build, the seals leaked almost from day 1.  Contemplated what to do for a couple of weeks, while *hoping* maybe the seals would come around or seat or something.  I got OEM Honda seals from my dealer and couldn't be happier.  The Leak Proof's were kind of sloppy in their fit, for me, with too much room above and below the seal - kinda made them "float". 

I'm not a subscriber to the "100% OEM mfgr only" mindset.  I used a healthy mix of Honda and aftermarket on my bike, but I'll never use anything other than Honda fork seals.
Rider no. 83 on the 2013 SOHC/4 Honda World Tour
Rider no. 228 on the 2012 SOHC/4 Honda World Tour
Rider no. 70 on the 2011 SOHC/4 Honda World Tour

my '75 CB750 cafe build photo documentary:  looking for the Lone Stars is like playing Where's Waldo -- enjoy.
http://www.flickr.com/photos/34828040@N05/sets/72157615892537535/

CB350 twin, rigid meat grinder:
http://www.flickr.com/photos/34828040@N05/sets/72157627005176764/

Blip Workshop
http://www.blipworkshop.com
http://www.facebook.com/blipworkshop

Offline MCRider

  • Such is the life of a
  • Really Old Timer ...
  • *******
  • Posts: 14,376
  • Today's Lesson: One good turn deserves another.
Re: Question about "leak-proof" fork seals
« Reply #6 on: May 28, 2010, 05:55:23 AM »
I had total crap luck with Leak Proof's Pro-Moly fork seals.  After spending so much time and effort on my build, the seals leaked almost from day 1.  Contemplated what to do for a couple of weeks, while *hoping* maybe the seals would come around or seat or something.  I got OEM Honda seals from my dealer and couldn't be happier.  The Leak Proof's were kind of sloppy in their fit, for me, with too much room above and below the seal - kinda made them "float". 

I'm not a subscriber to the "100% OEM mfgr only" mindset.  I used a healthy mix of Honda and aftermarket on my bike, but I'll never use anything other than Honda fork seals.
Sorry to hear of the bad experience.

THe marketing materials indicate  that they do "float", that is the term they use, and it is designed in. The push fit, vs a press fit, is also designed in.

I'm using them in my current project, hope they don't leak.
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline Johnie

  • Really Old Timer ...
  • *******
  • Posts: 8,609
Re: Question about "leak-proof" fork seals
« Reply #7 on: May 28, 2010, 05:58:58 AM »
If they have to advertise it as "leak proof" it probably will leak. I have replaced tons of seals and mine do not say leak proof...they only say Honda. Never had to replace a new set yet.
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline BobbyR

  • Really Old Timer ...
  • *******
  • Posts: 12,367
  • Proud Owner of the Babe Thread & Dirty Old Man
Re: Question about "leak-proof" fork seals
« Reply #8 on: May 28, 2010, 12:35:54 PM »
No matter what brand of seal you use it is mandatory that you polish the forks. Pis and small scratches will make any seal leak. The rule is, if you can feel it with your fingernail it will cause a leak in time. Polishing the forks with progressively finer grit sandpaper with ATF as a lubricant works very well. You just use a strip of the paper like shoeshine rag.
Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline Johnie

  • Really Old Timer ...
  • *******
  • Posts: 8,609
Re: Question about "leak-proof" fork seals
« Reply #9 on: May 28, 2010, 03:32:10 PM »
No matter what brand of seal you use it is mandatory that you polish the forks. Pis and small scratches will make any seal leak. The rule is, if you can feel it with your fingernail it will cause a leak in time. Polishing the forks with progressively finer grit sandpaper with ATF as a lubricant works very well. You just use a strip of the paper like shoeshine rag.

True...excellent point Bobby!!!
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA