Vintage AJS

This blog is about restoring vintage OHC AJS and Velocette motorcycles

Thursday, 25 September 2025

The DOHC 250 Velo Engine: Rebuilding the Crankshaft

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The objective here is to build a crankshaft that has a 68mm stroke and with mainshafts that are appropriate for the Mk 1 cammy engine to acc...
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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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