Vintage AJS

This blog is about restoring vintage OHC AJS and Velocette motorcycles

Saturday, 11 April 2026

KTT 581: Engine Rebuild – Part 1 – The Bottom End

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With the 2x KTTs and the 250 DOHC dry builds completed it was now time to give the engine of KTT 581 some TLC. It has been sitting forlornly...
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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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