Hermit's Triumph 650 Tech Articles
Complete tutorials on setting Triumph 650 ignition timing as well as assembling and indexing the gearbox, and many other basic maintenance and repair articles.
You know what they say, "Triumph! Makes a mechanic out of a man!".
How to Set ignition timing for Triumph 650 Motorcycles with Points
Triumph 650 Ignition Timing
Having trouble setting the ignition timing on your Triumph 650 points ignition? Then you've come to the right place!
Hermit's illustrated guide to setting points ignition timing identifies and
explains exactly what the heck each and every one of all those
little screws in there do! Includes detailed, step-by-step instructions for both static and dynamic timing.
Assembling the Triumph 650 4-Speed Gearbox
Indexing the Triumph 650 4-Speed Gearbox
Gearbox Photo Animations
Triumph 650 Gearbox Photo Animation: Front View
These photos show you exactly how the camplate and gears move in all the gears, in stills and as a unique photo animation of the Triumph 650 gearbox. Diagrams show the transfer of power through all the gears and indicate which gears spin and which gears are splined to their shaft. Highly educational!
Gearbox Reference Photos
The Spring Report - Mike James
Between '68 and '70, Triumph made many tweaks to 650 Triumph gearbox plunger springs, plungers, plunger holders, and gearshift camplates. What did it all mean?
Mike James evaluates and analyzes the changes in this detailed and superbly illustrated guide. Learn the difference between spring rate and spring force and why it matters. A must-read for those interested in a deeper understanding of these intricately related parts and the method to Meriden's "madness". (PDF, 8.5mb)
More Gearbox Info
"Triumph 650 Unit Construction Engine Overhaul Manual"
The "Triumph 650 Unit Construction Engine Overhaul Manual", written by Thomas G. Gunn, Jr. for Triumph Corporation Baltimore in 1967, is a field-tested, step-by-step blueprint for completely overhauling the iconic unit construction Triumph 650 engine. It lists engine changes and updated factory specs up until 1967.
In addition to correcting errors in the original and further updating technical info, Hermit's hypertext version offers seamless, one-click access to footnotes, table of contents, and direct links to corresponding sections in the 1969 Triumph Workshop Manual.
Have a look:
Triumph 650 Complete Overhaul Manual: Hypertext Version
Miscellaneous Tips & Techniques
Rear Wheel Alignment Using Mason Line
Proper rear wheel alignment is crucial to preventing excess tire, sprocket, and chain wear. If you're unfamiliar with working to a line, here are some tips on how to set a line on your bike to check alignment.
Here's an idea for getting those pushrods properly aligned with the rockers during reassembly, even if you're using
larger diameter custom lightweight pushrods.
The Usual Suspects
To dispell my confusion about the assembly order and orientation of front and rear axle rings, retainers, and dust covers on my 69 T120R, I organized these illustrated, cross-referenced parts line-ups. I also included photos identifying the rear axle nuts and distance pieces. All illustrations include parts book references, part numbers, and specs.
Triumph T120 Fork Dimension Changes for 1968/1969 - Mike James
Mike James guides us through the mine field of subtle changes that Triumph made to fork components during the years 1968 and 1969. Part numbers, specs, and illustrations to help you sort out your late-sixties Triumph front end. (PDF, 5.3mb)
NOTE: StuartMac, Triumphrat.net Vintage & Veteran Triumph moderator takes exception to a) the reason proposed by Mike for the increase in width of the 1969 model year forks, and b) Mike's suggestion that some later 1968 sliders required unified thread hardware. You can read Stuart's posts here
650 Triumph Front Fork Rebuild
Here are illustrated step-by-step instructions for reassembling the front fork for a 1969 Triumph T120R. Complete info, including rundown of special tools.
Wheel Rebuilding - by Phone
You can't tune a fish, but you can tune a motorcycle wheel..
If you don't know a hop from a wave, let guest tech writer Geoff Collins roll out the basics for you in this article about his first-time wheel rebuilding experience.
On the same subject, Peg spoke well in her most excellent tip-laden wheel building treatise: a step-by-step method full of sage advice. With photos. A must read. On TriumphRat.net.
Proprietary Clutch Locking Tool
A couple of used clutch plates and a short piece of iron pipe are all you need to make a handy tool which is essential for clutch and gearbox work.
Hans Muller's 1942 BSA WDM20 Restoration
For all our BSA riding mates, here's a great personal story from Hans Muller about his marvelous 1942 BSA WDM20 restoration.
Includes illustrated how-to descriptions of Hans' loving attention to details as well as WDM20 Service Notes, Wiring Diagram, and complete parts list.
The Polar Bear Rides Again!
Blimey! Why do my headlamp bulbs keep breaking?
Because you keep dropping them on the shed's cement floor? Because your pothole radar is defective? Or because you forgot to grease them?
Seriously! Also, some helpful(?) 'insights' on headlamp bulb test methodology
from our own in-house motorcycle mechanic extraordinaire,
The Bonnie Ref