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Lot 360: 1934 Sunbeam 599cc Model 9A

Collectors' Motorcycles, Bonhams (16 October 2005)

Sunbeam had begun experimenting with overhead valves on their factory racers in the early 1920s, and these duly appeared on production models in 1924. Known as the Model 9, the John Greenwood-designed 500 roadster was advanced for its day, with a specification that included a crankshaft supported by three ball-bearings, dry-sump lubrication and primary drive enclosed in an cast-alloy chaincase. Power was transmitted by single-row chain to a three-speed, ‘cross-over drive’ gearbox with offside power take-off. The latter gained four speeds as part of an extensive redesign for 1932, at which time an over-bored, 599cc version of the Model 9 - the 9A - became available. Offered for restoration, this incomplete 9A comes with old-style continuation logbook and Department of Transport letter linking the registration mark ‘CK 7820’ to the machine.

Lot Details
Auction Collectors' Motorcycles
Bonhams, Classic & Motorcycle Mechanics Show, Stafford
Lot Number360
Outcome SOLD
Hammer Price£1050
Hammer Price (inc premium)£1208
Condition rating
Registration number
Chassis number
Engine numberPP1243A
Engine capacity (cc)
Engine - cylinders
Number of doors