This Honda CB500 race bike was built in the 1970s by engineer Brian Brownrigg for Bolton-based rider Chris Hawkes, the bike won three separate championships in period, it was later lightly modified and registered for road use.
The 1970s were a time when the motorcycle world’s European old guard was being trounced by Japanese newcomers, upending decades of history and resulting in the rapid decline of the industry. Motorcycles like the Honda CB500 shown here were key to this success.
The Honda CB750 was released in 1969 to meet demand from US dealers for a larger capacity motorcycle to better challenge the dominant bikes from companies like Harley-Davidson, Triumph, Norton, and BSA.
As with almost all race bikes of this type from the 1970s, this CB500 has a full fairing with a windscreen allowing for an optimal top speed down the straight.
What no one knew at the time was that this new model would trigger a tsunami in the motorcycle would that would topple many of the world’s once great marques, fundamentally changing the motorcycle landscape forever.
Thanks to the incredible success of the CB750, Honda developed a new model based on the same architecture, but aimed at achieving in the middleweight market what the CB750 had achieved in the heavyweight market.
This new motorcycle would be the Honda CB500. It was fitted with a new engine that looked a lot like its larger sibling, but used new block, barrel, and head castings, with all new internals.
Like its larger predecessor, the CB500 was an inline-four with a single overhead cam operating eight valves, two per cylinder. It was fitted with four carburetors and the engine was built using unit construction, with an electric starter and a front disc brake.
This engine now has a displacement of 550cc, it’s also fitted with a Yoshimura YH-2-1 camshaft, Honda CG pistons, a bank of four 20mm Mk2 Amal carburetors, and a Kibblewhite valve spring kit.
Power output was a respectable 50 bhp and the top speed was 115 mph, both excellent figures for a motorcycle with this displacement at the time.
The CB500 produced as much power as many larger 650cc engined motorcycles, but without any leaks and without the hassle of using a kickstarter to get it going everyday. The model quickly became a best-seller and it wasn’t long before they began being modified for use on race tracks.
Perhaps the most successful racing version of the CB500 was the one ridden by Bill Smith at the Isle of Man TT in 1973, he won the 500cc TT Production race, finishing 8.2 seconds ahead of second place finisher Stan Woods.
The bike you see here is a highly modified Honda CB500, it was build by engineer and successful racer Brian Brownrigg for the Bolton-based rider Chris Hawkes.
This bike has a well stocked trophy cabinet, it won three separate championships at Three Sisters and led the Ace of Aintree championship among many other strong finishes.
Hawkes enjoyed some success at Aintree in the 500cc four-stroke Ace of Aintree championship and also raced at Cadwell Park. In 1982 the bike passed on to new hands, in the years after this it won three separate championships at Three Sisters and led the Ace of Aintree championship.
In the winter of 1982 the bike was given some significant mechanical servicing including a ported cylinder head, white metal shell bearings, and the crank was stripped in order for the connecting rods to be polished and balanced.
It’s now fitted with 20mm Mk2 Amal carburetors, a high-performance Yoshimura YH-2-1 camshaft, Honda CG pistons, a Kibblewhite valve spring kit, and a 56mm re-bore giving it a displacement of 550cc.
A few years later in 1997 the bike was registered for the road for the first time, it retains its road registration in the UK now which potentially makes it an ideal weekend bike for B-road adventures.
If you’d like to read more about this unusual CB500 or register to bid you can click here – it’s currently being offered for sale in a live online auction by Collecting Cars.
Images courtesy of Collecting Cars
Ben has had his work featured on CNN, Popular Mechanics, Smithsonian Magazine, Road & Track Magazine, the official Pinterest blog, the official eBay Motors blog, BuzzFeed, and many more.
Silodrome was founded by Ben back in 2010, in the years since the site has grown to become a world leader in the alternative and vintage motoring sector, with millions of readers around the world and many hundreds of thousands of followers on social media.
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