K-MaxX Honda CB 900 F Bol d’Or
Limited Edition – Honda Race Classic Cars
It was Honda’s homage to the victories at the 24-hour endurance race at Le Mans. Today it is a pile of iron with wooden brakes and moths in the tank until developer Marcus Klass from K-MaxX revamped it.
People only talked about the Bol d’Or behind closed doors. It was madness, recklessness and a bit of megalomania – and that in its original state. Here and now I am standing in front of a unique specimen that gives passers-by electric shocks just by looking. The Honda CB 900 F Bol d’Or (built in 1984) built by Marcus Klass is really outrageously contradictory because of its classic appearance combined with modern racing components.
S.Already when braking into the first corner I got cold: The load brakes, and how! And this fine pressure point, the transparent response, the complete feedback from the fork. Then the sharp precision when turning. Madness, sheer madness! The 26 year old iron pile falls like a Yamaha YZF-R6 into the curve. Did I say R6? And then this engine, this power unit. At full throttle out of the rev cellar, the acceleration pressure wave hits me like an anvil falling from the sky, only horizontally. Allegedly, the standard Bol d’Or turns quite tired towards the rev limiter. The K-MaxX Bol d’Or, on the other hand, runs so obsessively into the fiery red area, as if an additional injection pump per cylinder were working parallel to the carburetor battery.
A little breather can’t hurt. Just take a look how the builder was able to transform this lethargic iron pile into such an agile stinging chair. The most obvious changes are the golden Öhlins fork, struts from the same company, the 17-inch forged wheels from PVM and the aluminum swing arm of a Kawasaki ZRX 1200. What? A Kawasakian foreign body in the Honda classic? Madness! And then get the English on board: the Triumph Speed Triple’s wheel load distribution and caster served as a guide for the chassis geometry.
With the peripherals of the standard engine, the madness continues: Dynojet kit in the carburettor and a Dyna ignition system with control unit, from which 16 ignition curve mappings can be controlled and a speed limiter can be set between 9000 and 16000 rpm. Furthermore a K&N air filter for more air throughput and a performance-enhancing exhaust system from Moriwaki. The exhaust manufacturer equipped the Japanese Superbike Championship in the early 80s. All in all, it adds up to significantly more pulling power with a full tank of only 225 kg (series 260 kg): the work of a man possessed! But of course we’re still talking about an old motorcycle with old manners: sometimes it starts, sometimes it doesn’t. Sometimes she gasps or runs out of fuel. And sometimes, but really only sometimes, a bolt flies away and the rear brake fails. But that’s exactly what we’re looking for: character.
You have to talk openly about this Bol d’Or. Bought as a bargain for 1350 euros, Marcus Klass threw plenty of experience and hand-picked components into the scales in order to realize a dream: a classic sports motorcycle that drives like a new motorcycle, but has rough edges. An amazing enthusiast vehicle – unique and not for sale. Unless the price is right.
Dyna control unit: selector switch for ignition curve mappings (l.) And rev limiter (r.).
Four-cylinder in-line engine, air-cooled, 4 valves / cylinder, 63.5 kW (86.3 PS) at 9100 / min * on the crankshaft, 72.5 Nm at 7500 / min *, 902 cm3, bore / stroke: 64.5 / 69.0 mm, compression ratio: 8.8: 1, four Keihin carburetors (Ø 32 mm), multi-disc oil bath clutch, five-speed gearbox, Dynojet carburetor kit, programmable Dyna ignition system
Double loop tubular steel frame, aluminum swing arm made of Kawasaki ZRX 1200, steering head angle: 64 degrees, caster: 93 mm, wheelbase: 1525 mm. Öhlins upside-down fork FG43, fully adjustable, inner fork tube diameter: 43 mm, two Öhlins spring struts at the rear, fully adjustable, front / rear travel: 120/110 mm
Wheels and brakes
Forged alloy wheels from PVM, 3.5 x 17"/5.75 x 17", Front tires: 120/70 ZR 17, rear: 180/55 ZR 17. Tires: ContiRoadAttack 2, front: 320 mm double disc brakes with four-piston calipers, rear: floating 218 mm cast single disc
Rear wheel power in last gear
77.6 hp *
Top speed approx. 220 km / h
16 500 euros
* PS measurement
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