Jap engine dating
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Otherwise Lots shall be removed to local store in Stoke-on-Trent at the Buyer's expense (see below).
The production run started in 1935 as far as we can tell; engine types were Villiers and Blackburne on the early tractors, progressing to the JAP5 in 1938, through various American engines supplied under Lend/Lease during the war.
After WW2 the manufacturer went over again to using British engines with the JAP6 and Douglas SV54 making an appearance alongside the JAP5.
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Prior to the First World War, he equipped his motorcycles with De Dion, Minerva, Precision and Green engines and his use of proprietary engines continued after the war, with Blackburne, Bradshaw and JAP engines.
In 1922, the marque completed the fastest lap of the Isle of Man circuit for a 250cc machine on a tuned OK at 51mph (82kph).
The four-cam engine's designation was 'KTR', this example's 'U' suffix identifying it as manufactured in 1923.
Its copy Works Record Card reveals that this engine originally formed part of a Brough Superior SS80, frame number '649', that was despatched from the factory in August 1923 to Allen Bennett & Co in Croydon, Surrey.