1970 Don Sliger 1500cc Twin
Royal Enfield Engined Record Bike
Nature provided the best 'speed Bowl' in the
world when a vast salt water lake dried out
in Utah, USA. It left twenty miles of smooth
dead level salt to make Bonneville the ultimate
track for speed on wheels. Apart frm the pulicised
World Record aspirants hundreds of drivers and
riders trek t Bonneville to aim for class records
or milestone achievements.
Don Sliger's aim when he built this machine
was a class record which stood at 191.302mph,
the milestone he was secretly after was to be
first to top 200mph on an unstreamed bike. Streamlinging
can add one third to a bike's maximum). One
of the best ways to add straight line speed
is to add an extra engine (good for straight
line speed but not cornering).
Sliger knew from experience that chains were
not strong enough to link the two engines so
had hefty straight cut gears made. Surprisingly
the standard Royal Enfield gearbox and clutch
designed for one engine can take the strain
of two. Biggest surprise of all is the engines
fire up on the kick start. The frame is simple
but strong. Early high speed runds were mined
by tank slapper speed wobbles until Sliger altered
the steering geometry.
With that sorted, Sliger got his class record
with a two way average of 194.724mph. A chain
broke when he went for the 200 mph record but
not before he had doen 203.16 mph. The first
time an unstreanmed bikd has topped 200 mph.