Jekyll & Hyde: Norman Hyde Creates a Monster Bonneville

By Alan Cathcart, Photography by Kyoichi Nakamura

The tuned engine's displacement hike from 790 to 902cc is alone a worthwhile performance upgrade, even without the optimized carburetion obtained by fitting a pair of 35mm Keihin CR smoothbore carbs, matched to a ported and gas-flowed cylinder head carrying 2mm larger stainless valves fitted with stronger springs, and operated via special camshafts offering increased lift and longer duration. That extra performance is fed through the stock Bonneville five-speed transmission, but with a beefed-up oil-bath clutch with heavier springs and smaller Surflex aluminum plates that offer a higher clamp load.

Spending a couple days riding the Harrier along the Warwickshire highways and country lanes underlined just how successfully this bike captures the spirit of yesteryear in a modern context. It feels lighter and better balanced than the stock Bonneville. Sling a leg over the low, 30.5-inch-high seat and you find a close-coupled but surprisingly comfortable stance with pulled-back clip-ons that don't put undue weight on your shoulders. High footpegs and the upswept mufflers under your heels encourage you to ride in the classic style, parking your posterior on the hard padded seat and leaning with the bike as you hustle it round turns.

Do that, and surprise yourself with the amount of cornering speed you can carry. The Öhlins forks eats up rough roads and glues the quite grippy Avon Viper front tire to the tarmac. The Harris frame delivers a great sense of confidence, shrugging off the bumps on Britain's frostbitten, recession-ravaged roads, especially when cranked hard over in a fast fourth- or fifth-gear turn. No shaking of the bars in your hands, no speed wobbles, just planted.

There's noticeable extra zest all through the rev range on the Harrier compared to other Triumph twins, even Hyde-tuned ones. Get back on the gas exiting a turn and pickup is clean and precise. With 85 percent of peak torque already on tap at 2000 rpm, the Harrier will pull hard and strong practically off idle, with a sweet spot between 3000 and 6000 rpm you'll find yourself operating in most of the time. The spread of power and torque is so wide, you don't end up using the gearbox nearly as much as you might expect, and although you can feel power building in totally linear mode all the way to the 8000-rpm limiter, there's no excuse to ever flutter that. The forgiving nature of the meaty engine performance just asks you to short-shift at around 7000 rpm.

The very conservative steering geometry of the Harris chassis means that the Harrier is stable rather than quick-steering, but not so much you expend undue effort to make it change direction. It's in its element swinging easily from side to side along winding country roads, as you weight the footrests to change direction with that lovely, torquey motor lazily turning over just halfway to redline as it punches you out of turns with decisive urge. The Harrier's potent-yet-practical tuned Bonneville engine has enough punch to satisfy, but not so much you have to worry about preventing high-sides or hooking up the rear wheel. It's a great real-world ride.

The Hyde Harrier recreates one of the most distinctive, traditional Brit-bike themes, but in a 21st century idiom: the single-seat café racer. It's important to be able to see the engine, but you need the practicality and looks of a half-fairing, even if the Harrier's screen is too far back to easily tuck away behind down the straights. Get out the bandsaw, guys!

Dave Degens and the Triton ton-up Teds invented the café racer concept in the '60s; people like Paul Dunstall and Colin Seeley refined it; and Triumph, Norton and BSA all productionized it long before it was hijacked by the Italian mob in the '70s, or became the retro rage it is today. "You must remember that the original Thruxton Bonneville was the Honda Fireblade [CBR1000RR] of its day," Hyde proclaims. "It appealed to young lads who wanted the fastest, sexiest, most desirable bike around. The aim of the Hyde Harrier is to create a modern reference to that era, combining current technology and hassle-free reliability with improved performance and evocative styling."

Job done, I'd say.

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