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Honda GB 500TT Clubman Tourist Trophy

Make Model	Honda GB 500TT Clubman Tourist Trophy
Year	1989 - 91
Engine	Four stroke, single cylinder, SOHC, 4 valve
Capacity	498 cc / 30.3 cu-in
Bore x Stroke	92 x 75mm
Cooling System	Air cooled
Compression Ratio	8.9:1
Induction	Keihin PH 69
Ignition	CDI
Starting	Electric
Max Power	38 hp / 27.7 kW @ 7000 rpm
Max Power Rear Wheel	33.3 hp / 24.8 KW @ 7000 rpm
Max Torque	35.6 Nm / 26.3 ft-lb @ 6000
Clutch	Wet multi-plate coil spring
Transmission	5 Speed
Final Drive	Chain
Gear Ratio	1st 2.384 (31/13) / 2nd 1.555 (28/18) / 3rd 1.200 (24/20) / 4th 1.000 (23/23) / 5th 875 (21/24)
Front Suspension	35 mm telescopic forks
Rear Suspension	Dual shocks with adjustable pre-load
Front Brakes	Single 256mm disc
Rear Brakes	138mm Drum
Front Tyre	90/90 -18
Rear Tyre	2.50 -18
Rake	64°
Trail	105 mm / 4.1 in
Seat Height	880 mm / 34.6 in
Dry Weight	157 kg / 346 lbs
Fuel Capacity	20 Litres / 5.3 US gal

By 1989 the British twin cylinder motorcycles were replaced by British triples and primarily by the Japanese bikes. Each year the Tourist Trophy race was held on the Isle of Man and Honda was determined to bring back the flavor of those British twins with a bike that had look of the Norton and Triumph racing bikes. Honda responded by launching its GB500 (commonly known as the tourist trophy) as a retro-bike with styling and components that recalled fond memories for many motorcyclists of the classic British cycles. The GB500 was a clever package, designed to appeal to a new market that no current motorcycle maker had tapped: the classic, collectible cycles and the older enthusiast.

The GB is a sleeved down XL600 engine displacing 498cc.. This means that it has the same stroke as the XL600 i.e 75mm. Its also running 8.9:1 compression so kickstarts are easy. The engine has a gear driven balance shaft that is positioned at the front of the engine. This certainly helps keep it tame all the way to its 7800 red line. The single overhead cam is driven by chain that is on the right hand side of the engine. The Honda RFVC (Radial Four Valve Cam?) valve gear is accessed through the four separate covers.