WELCOME to my blog about restoring vintage overhead camshaft AJS and Velocette motorcycles

 

Apologies to anyone that has come to this page expecting to see exclusively vintage AJS motorcycles .....scroll down the page a bit and you will find plenty of them.

However, I sent all of my cammy AJSs to Bonhams last year and they were sold at the Autumn Stafford Sale. 

The URL of "vintageajs" for this blog is now somewhat misleading but it's too late to change it and there is still plenty to read about the AJAY projects. If you happen to be the new owner of one of the bikes that I recently sold then there is plenty here to read about its build. I still have 2 early Big Ports waiting in the wings ....but they will have to wait until I've completed the Velos. 

In 2023 I started the restoration of 2 early Velocette KTTs plus another Mk 1 OHC cammy special - a few details about each of these bikes can be found here and here. 

A lot of work has been done on these bikes over the past 3 years and the INDEX PAGE provides links in chronological order of these projects so far.

In August last year I acquired a DOHC 250 Velo Engine. I have completed the rebuild of this engine and the dry build of this bike is also finished. Details of this project can be found in the links in the INDEX page.

I also acquired the engine, exhaust pipe and petrol tank of KTT 581 early last year. This bike has an interesting and somewhat sad history. I have rebuilt the engine and plan to put this in a bike when I have completed the existing 3 Velos - full details of the project so far in the links here.

I am now working on the final builds of all 3 Velos for which the first 2 are complete.

This is KTT 305

and the DOHC 250.

 A few more details HERE.

During the last 5 years I have posted quite a lot of information and to aid navigation the "Labels" section on the right side of this page lists 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.

When I started this blog I owned 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 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 ....giving 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 use some of these to 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. 

This bike is now in the Sammy Miller Museum.

 

In January 2022 I started the restoration of a 1933 AJS Trophy Model

and this was completed in March 2023.

 

The Index Page for this project can be found here.

I also reported briefly 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.

Final Builds of KTT 305 and the DOHC 250

It took a bit longer than expected to complete the final build of the DOHC 250 because the UK (and much of Europe) has experienced temperatures normally associated with the Sahara desert for many days and it has been impossible for certain jobs to be completed. Anyway, the final builds of the first 2 bikes, KTT 305

and the DOHC 250,

are now complete. I have not made any attempt to start either of these yet – that will have to wait until after the final build of the 3^rd bike, KTT 55. There are also a couple of minor jobs yet to be done such as adding oil (!!) and setting the vertical position of the remote float chamber on the DOHC 250 to get the correct fuel level on the downdraft RN carburettor.  

Why has it taken a bit longer to complete the DOHC 250? Well, my powder coater first has to grit blast all of the components and he does this in a confined space (rather than a blasting cabinet) so that he can blast large structures such as a complete vehicle chassis and he dresses in full protective gear. This is a photo of the graphics from the side of his van

and it would be unreasonable to expect him to be working dressed like this in an enclosed space in the recent extreme hot weather when my car is registering 36⁰ C ambient temperature and I’m sitting in the shade of a large apple tree in the garden drinking cold beer. 

There were quite a few more bits and pieces to go in the plating bath for the DOHC 250, mainly due to the number of external oil pipes.

The parts to be chemically blacked were completed,

the exhaust pipes for the 3 bikes came back from Dorsetware after chrome plating and polishing (they have made a stunning job and highly recommended),

the petrol and oil tanks were painted in the back garden

and the bike reassembled.

So, the last bike in this batch of 3, KTT 55, is now up on the bench for the same treatment.