Identifying engine/frame numbers? - Triumph Forum: Triumph Rat Motorcycle Forums
Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 07-12-2007, 11:06 AM Thread Starter
Formula Extreme
Senior Member
 
Join Date: Aug 2005
Location: Missouri
Posts: 404
In addition to my TR6 engine rebuild project, I am also helping a buddy get his 65/68 T120 together. His title says it is a 65, but they frame and all other components clearly indicate it is at least a 68. I found the engine number but can't find the frame number - I looked late last night so I could have missed it but it is not in the place it normally would be. Where 68's different?

Also, how do I find the year for the engine - here is the id - DU16761. Also, the T120 stamp had SR behind it. I looked up the various alphabet combo's that are usually stamped behind the model ID and saw nothing for SR. Any ideas?

Not likely to die of natural causes
tri650 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 07-12-2007, 12:49 PM
Formula Extreme
Senior Member
 
Join Date: Mar 2004
Posts: 899
Engine number is from a 65 as is the SR designation. Don't know much about bonnevilles, but I don't think there were many SR's made. The frame number should be on the left side of the steering head unless tampered with.
triumphtimes is offline  
post #3 of 7 (permalink) Old 07-12-2007, 01:29 PM
SuperBike
 
Join Date: Aug 2006
Posts: 1,787
Starting in 67, the fork lock moved to the top of the steering head....there is a flange on the top of the casting with a hole in it. The 66 and earlier frames had the fork lock on the left side of the steering head, about in the center.
It's not uncommon to have rear frames not match the year of the main frame. Starting in 68, the left side panel is retained by two pins on the rear frame downleg and a knob on the upper front, with a tab welded to the rear frame just to the rear of it's top mounting point to the main frame.
65 was the only year which saw the crankshaft located by the LEFT ball main bearing, all others locate the crank by the RIGHT main bearing. When Triumph changed to a roller LEFT main bearing the next year, they went back to the old system, so the internals of the 65 are unique. For me, I would fit the roller to the left and use non-65 spacers, sprocket, and pinion. Just because the factory makes a goof doesn't mean I have to.

[ This message was edited by: Mecchanica on 2007-07-12 11:32 ]
Mecchanica is offline  
 
post #4 of 7 (permalink) Old 07-12-2007, 03:20 PM
SuperBike
Senior Member
 
DAGAD's Avatar
 
Join Date: Jan 2005
Location: DERBY, ENGLAND
Posts: 1,458
Well Mecchanica, you learn something every day. Today I have learned about the 1965 crankshaft assembly. I had one, rebuilt it and never knew about this 'goof'................. ALWAYS need to learn and I am pleased there are guys out there who are willing to teach us.
Roy.
DAGAD is offline  
post #5 of 7 (permalink) Old 07-12-2007, 09:30 PM
SuperBike
 
Join Date: Aug 2006
Posts: 1,787
It wasn't so much a goof as a change with no purpose. If both sides use ball bearings, then locating it by one is as good as the other, but I find it hard to believe that they didn't know they were going to change main bearings in 1966 when they decided to change the crank stuff. Just seemed strange.
The leaf spring detent is another one. Changed something which was nearly flawless and could be changed from the outside, to something which didn't work as well and couldn't be changed unless you pulled both the outer and inner covers. Duh.
Mecchanica is offline  
post #6 of 7 (permalink) Old 07-13-2007, 03:25 PM
SuperBike
Senior Member
 
DAGAD's Avatar
 
Join Date: Jan 2005
Location: DERBY, ENGLAND
Posts: 1,458
Unfortunately my friend, that was the BSA influence. I have had many a conversation with John R. Nelson (our club Patron) regarding the 'BSA influence' he is still very bitter about that time. That was really the begining of the end, SLUMBERGLADE......................................
Roy.
DAGAD is offline  
post #7 of 7 (permalink) Old 07-16-2007, 03:41 PM
SuperBike
 
Join Date: Aug 2006
Posts: 1,787
Bsa

Agreed. I remember Jack Wilson raging at the Factory when they tried to get the Triumph dealers to also sell and service BSAs. He threatened to dump them and sell Hondas and, I think Bridgestones. So did a lot of other dealers. The factory relented.
Mecchanica is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options
All posts must adhere to Forum Rules

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:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Thoughts on frame numbers Rhnstn Classic, Vintage & Veteran 6 01-09-2008 02:07 PM
Frame Numbers NeilD Hinckley Classic Triples 1 09-26-2006 02:23 AM
Engine and frame numbers Soccermasta Air Cooled Twins Technical Talk 2 08-28-2006 11:08 PM
5t engine numbers? 65bonnie Classic, Vintage & Veteran 2 04-01-2005 06:32 AM
Fuel Fittings - Affected frame numbers Sprint Forum 3 10-13-2004 01:10 AM

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome