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Switch Hitter: Porsche guru Dutchmann tackles a Jawa

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Switch Hitter: Porsche guru Dutchmann tackles a Jawa Switch Hitter: Porsche guru Dutchmann tackles a Jawa

Switch Hitter: Porsche guru Dutchmann tackles a Jawa






If you?re into classic Porsche 911s, you?ve probably heard of the restorer Dutchmann. In his Johannesburg, South Africa workshop, Gavin Rooke painstakingly rebuilds classic Neunelfers to concours level, and ships his ?Weekend Racers? all over the world?ready to be thrashed around tracks, up hill climbs and through deserts.
But every so often Gavin and his craftsmen take on a special project, to keep their skills fresh: ?We seek inspiration from different people and their interests,? he says. One such individual is 65-year old Bobby Hack (below), a retired Speedway legend who lives in the Eastern Cape.

?I was hunting for a second-hand speedway bike to convert into a Dutchmann ?Desert Racer? and came across Bobby,? says Gavin. ?He?d hit some tough times, and needed to sell his old speedway parts.?
?As we got chatting, he mentioned he also owned a super-rare, complete 1968 Jawa 2-valve speedway bike. I convinced Bobby to work with us on a tandem project, to restore the Jawa to Dutchmann standard.?

A little background, in case you live outside the speedway hotbeds of Europe and Australia: the bikes have only a single gear and no brakes.
Their 500cc engines rev up to 11,000 rpm and run on methanol?which allows 16:1 compression ratios to produce upwards of 80 horsepower.

Gearing can be changed for different tracks and conditions, but only by changing the size of the rear wheel and the engine sprockets. Riders race around an oval track packed with shale and dirt, using the surface to powerslide into the bends. They easily reach speeds of up to 110 mph (177 kph) on the straight sections.

It took Bobby and the craftsmen of Dutchmann three years to complete the nut and bolt restoration of the 1968 Jawa, which now sports Dutchmann?s signature grey paintwork and tan leather detailing.
?We weren’t in a rush,? says Gavin. ?This is a very rare and special bike, so we needed to respect its heritage whilst still bringing our unique aesthetic to bear.?

Bobby Hack has been building bikes since the age of 10. ?I restored an old BSA at the age of 16 and rode it to school,? he recalls, and then trained under the eye of Ian Scheckter?the brother of 1979 Formula One world champion Jody Scheckter.
The Jawa arrived in Africa via another champion: the Australian speedway rider Geoff Curtis, who won nine Australian speedway caps.

Bobby managed the mechanical aspects of the rebuild. The 500cc 2-valve pushrod ?upright? motor runs on castor oil using a classic ?total loss? system where the frame serves as the oil tank.
?All oil that isn?t burnt in the mechanical process is pumped out onto the track surface,? says Bobby. ?These bikes were built for purpose and are wonderfully simple to work on.?

The motor was fully rebuilt, and given a light hone and refurbishment. But there was little to replace other than a set of rings and the Lucas magneto.
Given the use of methanol and castor oil, zero carbon build-up means a well-maintained speedway motor remain s...
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Switch Hitter: Porsche guru Dutchmann tackles a Jawa Switch Hitter: Porsche guru Dutchmann tackles a Jawa

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Fuente de la noticia: bikeexif
Fecha de publicación: 30-01-2018 21:47
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