1960 Potts-McIntyre Norton
- Flying Scotsman's Special
Joe Potts ran a car sales, taxi and funeral
business in Belshill, Glasgow. He sponsored
motorcycle sport as a hobby and his best-known
protege was fellow Scot Bob McIntyre.
McIntyre famously won the 1957 Senior TT on
a Gilera four, setting the first 100 mph laps
of the Mountain course. In the following year
he returned to the Potts stable to develope
and race its single-cylinder racers.
McIntyre prepared his machines at the Belshill
workshops, helped by mechanic Pim Fleming and
the company's welding wizard Alec Crummie. Among
hardware that emerged were 350cc and 500cc specials
wheeled out for 1960. They were identical except
that the bigger version has a Manx Norton engine
and the three-fifty an AJS 7R unit. McIntyre
usually raced in both classes and disliked switching
between frames with different characteristics.
Although based on Norton's Featherbed, the
special frame differed from in several respects.
The main tubes were no longer full loops. Instead,
the top rails ran back to the top rear suspension
mounts, while the cradle tubes rose vertically
to join the top rails at right angles.
The oil tank is on the left of the frame and
has a large heat-dispersing side surface. Free
space surrounds the Amal GP carburettor's intake,
to where cool are is directed from an intake
in the fairing.
On the Norton special's English debut at the
1960 Silverstone Hutchinson 100, McIntyre won
the 500cc race from Mike Hailwood. The Scots
rider rode for Honda from 1961 but continued
to race Potts' singles and created an all-new
chassis for his AJS. A fatal crash at Oulton
Park in August 1962 prematurely ended Bob Mac's
Engine - 499cc (86 x 85.62mm) air-cooled
double overhead camshaft single, 11:1 compression
ratio, Amal 1 1/2in carburettor, magneto ignition
Transmission - Chain primary drive, dry
multiplate clutch, four-speed gearbox, chain
Chassis - Tubular double cradle frame, telescopic
fork front suspension, swinging arm rear suspension,
Wheels - 19in
Power - 50bhp @ 7200 rpm
Top Speed - 130 mph, depending on gearing