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Mar 11th, 2023
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I'm assuming there is no way to remove the old fork lock on a 1975 Commando 850 Mk3 without removal of the yoke? My lock is severely corroded and in addition, there is no key. I found an NOS lock new in the box. Since the lock mechanism has to drop through the bottom and there is no clearance, I believe I need to remove the yoke to replace the lock. The yoke could use a little refurbishment, so that wouldn't be too much of a chore. I've found all kinds of advice on the internet, a lot of which is incorrect.
Last edited by Gary Caines; 01/05/22 11:16 pm.
Current Bike: 1968 Triumph Bonneville T120R, 1969 BSA Victor Special, 1975 Norton 850 Commando John Player, M1030M1 U.S.M.C. Diesel
Previous British Bikes: 1968 BSA Lightning, 1969 BSA Lightning, 1969 BSA Firebird Scrambler, 1972 BSA B50 Gold Star, 1974 Triumph Trident
Previous Non-British Bikes: 1983 BMW R80RT
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L.A.B is correct: the lock is held in place with a roll pin.
Yes, you do have to remove the yoke to get at the lock and the roll pin. I did this job on my MKIII about 20 years ago, and it was an awful job, because the roll pin is not easy to extract. As I recall, I ended up having to drill out the roll pin with a carbide bit because the pin is hardened .
.. Gregg
Spyder Integrated Technologies Lucas & BTH Magneto Restoration Lucas & Miller Dynamo Restoration SMITHS Chronometric & Magnetic Instrument Restoration [email protected]
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Correct term (in USA) is slotted spring pin. Hole is over a #32, good for rough drill.... 3mm is probably final size.
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Maybe in New England it's a "slotted spring pin," but in the rest of the USA it's called a roll pin.
Moderator EDIT: USA catalogs USA engineering specs. A roll pin is often continuous with no slot if more than 1 wrap.
Pix of norton component HAS slot
roll pin name is used as they sell to under educated however you might not get the correct item if you order a roll pin....
I may currently live here... but have worked professionally in every state in the USA.
Who knows what AN currently sells or wants to call them? but My 3 MKIII's have slotted spring pins NOT roll pins. My many sizes of roll pins are in the shop hardware drawers.
Last edited by Dave Comeau; 02/02/22 11:35 pm.
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Napa 1001 S main st Elburn Ill search shows 4196 Results for "slotted spring pin"
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Pix of norton component HAS slot
but My 3 MKIII's have slotted spring pins NOT roll pins.
Who knows what AN currently sells or wants to call them? Named in the factory parts book as a "Rollpin", therefore, what it ought to be referred to, as. Also known as a Sellock pin: https://www.crossfords.co.uk/Products/Sellock_Pins"A Sellock pin, (Also known as a Spring pin, Roll pin and Tension pin, is used to secure the position of two or more parts of a machine relative to each other." https://www.bolts.co.uk/spring-pins-c-4594/"Spring Pins go by many different names, including spring tension pins, Sellock pins, roll pins and slotted spring pins." Or a Spring Roll Pin https://www.almabolt.com/pages/catalog/pins/springroll.htmIt would appear that any pin formed from a flat sheet can basically be considered a roll(ed) pin.
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