Practical Sportsbikes (UK)

1991 YAMAHA TDR250

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ENGINE

Type: liquid-cooled, two-stroke parallel-twin with YPVS

Capacity: 249cc

Bore x stroke: 56.4 x 50mm

Compressio­n ratio: 5.9:1

Carburatio­n: 2 x TM28SS Mikuni Ignition: transistor­ized

TRANSMISSI­ON

Primary/final drive: gear/chain Clutch: wet, multiplate Gearbox: 6-speed

CHASSIS

Frame: tubular steel cradle Front suspension: 38mm telescopic forks, adj preload Rear suspension: Monocross monoshock, adj preload Front brake: 1 x 320mm disc, 4-pot Sumitomo caliper Rear brake: 210mm disc, 2-pot caliper Wheels: wire-spoked, alloy rims

Tyres: (Kes’s bike) 110/90 x 18 (110/70 x 17) front 120/80 x 17 rear (140/70 x 17)

DIMENSIONS

Wheelbase: 1385mm (54.5in) Seat height: 820mm (32.2in) Fuel capacity: 14 litres (3 gals) Dry weight: 137kg (302lb)

PERFORMANC­E

Power (claimed): 45bhp@10,000rpm Torque (claimed): 26.7ft.lb@8500rpm Top speed: 110mph

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