As 1923 dawned, over 20 British makers – including Brough Superior, Coventry Eagle and Morgan – fitted JAP engines to some/all of the machines they made. JAPs were also employed by makers of four-wheel cyclecars, and overseas makers. Add to this that Bert Le Vack, Vivian Prestwich, Teddy Prestwich, Stan Greening and others were earning JAP engines many plaudits at Brooklands, and more were doing well for the company in other fields, it should have boded well – and to an extent it did. But JAP was challenged weekly by Blackburne, plus many small makers who employed proprietary engines were stopping production while more big, volume players used their own.
In April 1923, JAP unveiled a new engine, the 346cc (74 x 80mm) ohv single, aimed at racing and fast roadsters. Features included a detachable semi-hemispherical cylinder head, large for a 350 tungsten steel tulip valves, alloy domed piston, roller big-end, hollow pushrods, hollow tappets and generous cooling fins.
Denne historien er fra September 2020-utgaven av The Classic MotorCycle.
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Denne historien er fra September 2020-utgaven av The Classic MotorCycle.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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Runs should be fun
The club run is an integral part of the old motorcycle scene. During 2020, a variation on the usual theme emerged, enabling people to ride in the company of like-minded souls.
Hybrid chicken
BSA Bantams come in many forms, and the ability to interchange parts between different models permits an almost endless number of variants.
Green WITH ENVY
Life aboard a 1950s 350cc British single is perhaps as good and as uncomplicated as it can get.
Worth the wait
Captivated by sight of one as a small boy, finally our man has the chance to try an NSU Max.And a ‘Spezial’ one at that…
The Motorcycle: DESIGN, ART AND DESIRE
The concluding part of a two-part feature, in which the history of motorcycle evolution is examined and a new book’s author interviewed.
Cream rises
There were several ‘star performers’ at Bonhams’ winter sale, as the choice machines achieved huge sums.
The Giant of Provence
With so few events to report from, it’s time to look back over a spectacular French event and look forward to its hopeful resumption.
Store cupboard special
A big box of presents? Must be Christmas! More deliveries keep the project on track.
By 1929, CJP Dodson was a bona fide top level road racer, pretty much unbeatable on the sand, too.
The diminutive Charlie Dodson was the last man to win a TT, the 1928 Senior, on a ‘flat-tank’ machine, then the next year became the first (and only) winner of a TT on a saddle tank Sunbeam, as well as recording the last ever success in the Island for the Marston maker.
Cassandra the Canadian Commando
After landing a new job and with time on his hands, a young man in Vancouver decided to restore a British motorcycle considerably older than him.