Thursday, 16 June 2022

WELCOME to my blog about restoring vintage overhead camshaft AJS motorcycles


.....although a few other projects creep in from time to time.

I have just added what is probably my last blog post on the V-Twin project for some time, The AJS V-Twin Postscript. The last post was in December 2021 and a lot has happened since then. Whilst I have been progressing with the 1933 AJS 33/7 Trophy I have also been shaking down the V-Twin. Since the beginning of May we also have 2 new additions to our household; Tanya and her daughter from Kyiv who have fled the pointless and terrible war in Ukraine. Tanya and the latest incarnation of the bike are pictured below.

During the last couple of years I have posted quite a lot of information and to aid navigation the "Labels" section on the right side of this page list the various projects.

The labels marked "INDEX" give a link to a page that provides a complete list and links to all of the separate sub-projects related to that main project.

Alternatively, scroll down this page and see what's here...

I already owned (and still own) a 500cc AJS R10

that I've been riding for many years and wanted an early 350cc bike. I bought one at a Bonhams auction; this is what I brought home....

....a bit of work was needed to bring it to back to life 

Full details of the restoration can be found here.

During the restoration of the K7 I figured that I could put an early overhead camshaft Velocette cylinder, cylinder head and cambox onto the crankcases of an AJS 350cc engine from 1931, convert it to chain-driven OHC and make an engine that looks like a K7 but has a Velocette top-end. I had a 1928 350cc AJS sidevalve that I had bought on eBay and used that to create the AJcette credit to both manufacturers.

It looks pretty similar to the K7 and to demonstrate that there really are 2 bikes, here they are both together.

Details of the AJcette project can be found here.

I have quite a lot of early Mk1 OHC Velocette parts and after completing the AJcette I decided to try and make a replica of a one-off bike that AJS built in 1929/1930 for an attempt on the world speed record. The original is a huge V-Twin beast that started out with a naturally-aspirated engine but, having failed to gain the record, was supercharged ...and again failed. The bike ended up in Tasmania for many years and, after being repatriated to the UK and restored, it is now in the National Motorcycle Museum.

This is what the original looked like:

and this is my recreation.



Like the AJcette, the V-Twin uses Mk 1 OHC Velocette cylinder components. The full story of how this bike was built can be found in the links here.

There is also a 14 minute edited Youtube summary of how these bikes came about here and a longer unedited version here.

....and so to the current project. I have started (January 2022) the restoration of a 1933 AJS Trophy Model.

The Index Page for this ongoing project can be found here and I'll add more  as the project evolves.

I also reported on a couple of my other projects ....vintage OHV Nortons

 and putting a Marshall supercharger onto my 1934 MG PA


I hope you find something of interest.

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