Vintage AJS

This blog is about restoring vintage OHC AJS and Velocette motorcycles

Saturday, 28 February 2026

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

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  Apologies to anyone that has come to this page expecting to see exclusively vintage AJS motorcycles .....scroll down the page a bit and ...

The DOHC 250 Velo Engine: Completing the Engine Build

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There were a few outstanding jobs before the engine build was complete. I already had a rebuilt BTH TT magneto but this needed new studs to ...
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Friday, 6 February 2026

The DOHC 250 Velo Engine: The Lubrication System – Part 2

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Having decided to change the lubrication system to take oil directly from the pump and direct it to important parts of the engine (see here ...
Wednesday, 24 December 2025

The DOHC 250 Velo Engine: Inside the Cambox

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I have intentionally not disturbed the cambox up to this point in the engine build. Why? Well, because it appears to work just fine and ther...
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Contact Richard at vintage.ajs.uk@gmail.com

Vintage AJS
Richard Johns spent 45 years in the engine industry, starting in 1969 as a student with Perkins Engines. After completing a PhD at Imperial College, London in 1980 he subsequently worked for AVL in Graz, Austria, Ricardo Consulting Engineers and CD-adapco (now a division of Siemens) developing and applying Computational Fluid Dynamics software to IC engines before retiring in 2015. Since retiring, he spends his time restoring vintage motorcycles.
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