Fork Tube Identification - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

Reply
 
LinkBack Thread Tools Display Modes
Old 09-09-2009, 06:57 PM   #1 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2006 Scrambler
 
oldroadie's Avatar
 
Join Date: Jun 2007
Location: Fort Payne, Alabama
Posts: 850
Extra Motorcycle: 1987 BMW R80
Fork Tube Identification

I've been approaching work on my 64 Trophy with great anticipation and expecting some delays but I was somewhat dismayed when I saw this as I began to change the fork oil:



I believe I have a set of 1969 forks but my manuals only go up to 1968 so I don't readily have access to the thread sizes I'll need to pull the stanchions and do a real disassembly (warranted I believe due to the amount of water mixed into the fork oil seen above). I'd really appreciate any advice you more knowledgable fellows will grant me.
__________________
2006 Scrambler
1987 BMW R80
oldroadie is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 09-09-2009, 11:16 PM   #2 (permalink)
Member
Grand Prix 125
 
Join Date: Jan 2009
Location: Reno, NV
Posts: 37
These are from a 1970 parts book, I believe the 69 is the same





I have a 1969 and on workshop manual also if that will help
NeoDutch59 is offline   Reply With Quote Quick reply to this message
Old 09-10-2009, 07:49 AM   #3 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2006 Scrambler
 
oldroadie's Avatar
 
Join Date: Jun 2007
Location: Fort Payne, Alabama
Posts: 850
Extra Motorcycle: 1987 BMW R80
Thanks for the schematic. No question, that's my triple tree and fork set up. It's the cap nuts that have me puzzled as my pitch gauge measured the threads at 28 but the workshop books don't list that diameter bolt as having that thread pitch. Then there's the matter of the cap nuts being slightly different in length and appearance; that is, the right doesn't quite match the left but the thread pitch seems the same. Since I can't used the motor/frame number as a guide I can't tell which of the two service tools I need to pull the stanchions.
__________________
2006 Scrambler
1987 BMW R80
oldroadie is offline   Reply With Quote Quick reply to this message
Old 09-10-2009, 09:47 AM   #4 (permalink)
Senior Member
Team Owner
Main Motorcycle: T140 E
 
Join Date: Jun 2009
Location: Reading Berks UK
Posts: 5,412
Other Motorcycle: 56 Plunger Tatty Cub
Extra Motorcycle: CZ winter bike
you can buy a universal fork assembly tool if that's what you're after?

http://cgi.ebay.co.uk/Fork-Assembly-...d=p3286.c0.m14

it's also shown here

http://cgi.ebay.com.my/FORK-ASSEMBLY...mZ140328585030
DAVE M is online now   Reply With Quote Quick reply to this message
Old 09-10-2009, 10:09 AM   #5 (permalink)
Senior Member
SuperBike
Main Motorcycle: '68' T120 Bonneville
 
Join Date: Nov 2007
Location: corpus christi, texas
Posts: 1,794
Other Motorcycle: 2006 T100 Bonneville
Extra Motorcycle: '79' T140 street tracker
I believe you are correct in your assessmant that they are 28 tpi. I looked at the parts breakdown for my '68' and the numbers for the top cap and bottom bearing nuts are the same as what is listed for the '69'. I bought a set of stanchions from a reputable vendor after discussing the 28 tpi I was measureing and was told it had to be 26 tpi. When the stanchions arrived, the caps and nuts wouldn't thread in all the way. I sent the stanchions back and ordered a set from Franks Forks and they fit perfect.
jimmy bush is online now   Reply With Quote Quick reply to this message
Old 09-12-2009, 09:20 AM   #6 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2006 Scrambler
 
oldroadie's Avatar
 
Join Date: Jun 2007
Location: Fort Payne, Alabama
Posts: 850
Extra Motorcycle: 1987 BMW R80
Thanks for the Franks Forks advice. I'll contact them to see if new tubes are feasible on my current budget (which, of course, is nothing).

And, there's more to this. I now believe I may have one 28 tpi stanchion tube and one 26 tpi but to confirm that I'll have to come up with a method of measuring the pitch inside the tubes. My pitch gauge doesn't have a 26 tpi leaf. That may take me a day of thinking before I can come up with a suitable method; although, I'm thinking of running a dowel in to capture the thread pattern and then measuring the dowel.

Since I'm unsure of the tubes and therefore the legs I think I need to disassemble them completely and I was wondering about the restrictor rod at the base. From what I can glean from the various manuals there are a couple of different types and the only way to know is to withdraw them. The method isn't clearly written; am I correct that the restrictor rod has a hex head and is captured in the base of the leg so that removing the bolt form the recess at the bottom frees it for removal?

All advice is most welcome.
__________________
2006 Scrambler
1987 BMW R80
oldroadie is offline   Reply With Quote Quick reply to this message
Old 09-12-2009, 10:07 AM   #7 (permalink)
Lifetime Premium
Site Supporter
Moto Grand Prix
Main Motorcycle: Triumph Bonneville
 
Join Date: Oct 2008
Location: Bordeaux, France
Posts: 2,886
Other Motorcycle: Triumph Speedtriple
Hi Oldroadie,

"am I correct that the restrictor rod has a hex head and is captured in the base of the leg so that removing the bolt form the recess at the bottom frees it for removal?"

You are indeed correct, you may need to clamp the stanchion in something to stop it from turning (try not to damage the chrome!)

I hope this helps

Webby
Webby is offline   Reply With Quote Quick reply to this message
Old 09-12-2009, 10:19 AM   #8 (permalink)
Senior Member
SuperBike
Main Motorcycle: '68' T120 Bonneville
 
Join Date: Nov 2007
Location: corpus christi, texas
Posts: 1,794
Other Motorcycle: 2006 T100 Bonneville
Extra Motorcycle: '79' T140 street tracker
On the thread pitch measurement, use the ones on the cap nuts, they're exposed and easy to get to. I'd compare one nut to the other and see if the threads mesh when held next to each other. If you have one that measures 28tpi and they dont mesh, the other is probably going to be 26 tpi as I think that was the only pitches they used for the forks. The bottom nuts will be the same pitch as the top of each fork so if you have a mismatched set of stanchions, and decide to buy a new set, you'll need to figure in one set of new top and bottom nuts unless you can find a vendor willing to send one stanchion of each thread.
jimmy bush is online now   Reply With Quote Quick reply to this message
Old 09-12-2009, 08:25 PM   #9 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2006 Scrambler
 
oldroadie's Avatar
 
Join Date: Jun 2007
Location: Fort Payne, Alabama
Posts: 850
Extra Motorcycle: 1987 BMW R80
Quote:
Originally Posted by Webby View Post
Hi Oldroadie,

"am I correct that the restrictor rod has a hex head and is captured in the base of the leg so that removing the bolt form the recess at the bottom frees it for removal?"

You are indeed correct, you may need to clamp the stanchion in something to stop it from turning (try not to damage the chrome!)

I hope this helps

Webby
Ah, Webby, you are so correct. A leather strap to hold the leg in the vise to prevent scarring and a couple of extensions on a deep well socket and out they came. At least the restrictors are identical so no worries there. The stanchion tubes? Jury's still out on them...
__________________
2006 Scrambler
1987 BMW R80
oldroadie is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Adjustable fork identification sailfish T3 Sport / Touring Forum 0 02-17-2009 11:30 AM
TBS Fork tube help blackfly911 Hinckley Classic Triples 8 03-27-2008 08:54 PM
Fork Identification MNTriGuy Classic, Vintage & Veteran 10 12-08-2007 01:26 PM
TBS Fork Tube pain. blackfly911 Hinckley Classic Triples 14 09-12-2007 09:19 PM
Fork tube.... NewMetal Twins Technical Talk 0 05-09-2007 08:18 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 02:10 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.