BritBike Forum logo
BritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorThe Bonneville ShopBritBike Sponsor
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
ShoutChat Box
Comment Guidelines: Do post respectful and insightful comments.
Buy BritBike staff a coffee
Buy BritBike's staff a coffeeStill here since 1996 serving BritBike enthusiasts..
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Member Spotlight
paulberry
paulberry
Stamford
Posts: 269
Joined: December 2006
Show All Member Profiles 
Newest Members
Mr. Bean, rudi, Derek, Psychorider, Shedengineering
10861 Registered Users
Top Posters(30 Days)
franko 173
DavidP 66
reverb 65
NickL 61
Popular Topics(Views)
1,012,134 mail-order LSR
a word from..
Forum Statistics
Forums34
Topics67,774
Posts680,171
Members10,861
Most Online14,755
May 5th, 2019
Who's Online Now
70 registered members (998John), 385 guests, and 683 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
1976 t140 fork seals #143303 06/21/08 9:54 pm
Joined: Apr 2007
Posts: 200
P
peter berry Offline OP
BritBike Forum member
OP Offline
BritBike Forum member
P
Joined: Apr 2007
Posts: 200
Im replacing the fork seals on my 76 Bonny the new seals Ive got are thicker than the originals on the originals there was a cover plate over the seal with the new seals they come right up top the lip of the tube and there is no room for the cover plates , I dont see these plates in the parts book but they look original Thanks Peter

Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK
British motorcycles on e-Bay North America
Re: 1976 t140 fork seals #143304 06/21/08 10:14 pm
Joined: Mar 2006
Posts: 4,121
L.A.B. Online Content
BritBike Forum member
Online Content
BritBike Forum member
Joined: Mar 2006
Posts: 4,121
Quote
Originally posted by peter berry:
I dont see these plates in the parts book but they look original
The 97-7010 seals with retaining washers were used 1978-on, but can be fitted to the earlier OIF model forks, which is probably what you found installed? They are soft seals and when installed there ought to be a gap between the seal and the retainer?

How deep are the new seals? Were they supplied (or did you order them) under any specific part number? As the original '76 seal part number would have been 97-4001.

Re: 1976 t140 fork seals #143305 06/21/08 11:15 pm
Joined: Apr 2007
Posts: 200
P
peter berry Offline OP
BritBike Forum member
OP Offline
BritBike Forum member
P
Joined: Apr 2007
Posts: 200
The bike must have had the newer seals the ones I am replacing with are the 97-4001s so should be OK Thanks

Re: 1976 t140 fork seals #143306 06/21/08 11:28 pm
Joined: Apr 2006
Posts: 1,704
SBoyd Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Apr 2006
Posts: 1,704
I believe the factory used those metal rings when they started using "Leak Proof" seals.
I don't use the metal rings or the Leak Proof seals.
Leak Proofs seem to have more stiction and don't work any better.

>>sb


Stop the insanity.
Re: 1976 t140 fork seals #143307 06/22/08 3:54 pm
Joined: Aug 2005
Posts: 1,208
S
Steve in Tulsa Offline
BritBike Forum member
Offline
BritBike Forum member
S
Joined: Aug 2005
Posts: 1,208
I put Leakproof seals on my 79 T140D and they work great. The trick seems to be the gap between the seal and the ring.
Just my 2c


Steve in Tulsa
Re: 1976 t140 fork seals #143308 06/23/08 12:06 am
Joined: Feb 2008
Posts: 163
dale karger Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Feb 2008
Posts: 163
i ran into the exact same thing on my 76. that ring is not in the parts book for the 76 and was a upgrade done later. you can replace it with either kinds of seals but i suggest getting the leakproof. they get a little tricky because they "float" between the bezel of the fork leg and that ring. the originals dont float but are a snug fit into the top of the fork leg.


76 T140V
79 Honda CB 650
79 Yamaha 175 Enduro
68 Chevy Impala Convert
- - - - - - - - - - - - - - - - -
Re: 1976 t140 fork seals #143309 06/25/08 12:39 am
Joined: Jun 2002
Posts: 10,005
S
Stuart Offline
BritBike Forum member
Offline
BritBike Forum member
S
Joined: Jun 2002
Posts: 10,005
Hi Peter,

Another vote for the later ("leakproof") seals.

Quote
Originally posted by SBoyd:
Leak Proofs seem to have more stiction and don't work any better.
Fwiw, I never noticed any more stiction on the T160's forks when I swapped 'em to Leakproofs, but the Progressive Suspension replacement for the damper top 'O'-ring does reduce stiction.

As for "don't work any better", original-type seals on the T160's were a nightmare; the left on in particular never lasting very long - I put that down to the fork twist induced under braking by the single caliper. Certainly, since I fitted twin front calipers along with the Leakproof seals, I've never had any more trouble. wink

Hth.

Regards,

Re: 1976 t140 fork seals #143310 06/25/08 2:28 am
Joined: Apr 2006
Posts: 1,704
SBoyd Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Apr 2006
Posts: 1,704
Peter and Stuart,

The only job that the fork seal has to do is to keep the oil inside. Whilst doing so, it should introduce minimal stiction.

My experience the past few years is that the modern replacement 97-4001 (half the price of Leakproof) from my local dealer (M&S Cycle)
does not leak. (Maybe distributed by EMGO?)
And you don't have to deal with the metal ring.
smile

>>sb


Stop the insanity.

Moderated by  John Healy 

Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | DVD- Manuals & Parts books
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.7.3