A longside JAP speedway engine development, specialists made frames, including speedway rider Alec Jackson, who was to later take over speedway engine production.
Most off-season during the early/mid 1930s, engine development work had two objectives – reliability and power. For example, over winter 1932/3, the cylinder head was modified, which, with other details, took measured (at the crankshaft) output to over 40bhp.
At the same time, for reliability, the rocker box was redesigned, the small oilbox for gravity feeding the valve stems between races was dropped, with the rocker box redesigned to accept an oil feed.
This story is from the December 2020 edition of The Classic MotorCycle.
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This story is from the December 2020 edition of The Classic MotorCycle.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
Already a subscriber? Sign In
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