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APRILIA AF1 '90 |
Martin Wimmer's machine at Nürburgring
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ENGINE TYPE |
two-stroke, water cooled
twin cylinder (90º V formation):1
rotary disc valve (2 rotors on the right side)
twin crankshaft (turn in opposite directions):2
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BORE × STROKE |
54 × 54.5mm |
DISPLACEMENT |
249.6cm³ |
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COMPRESSION RATIO |
15:1 |
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EXHAUST DEVICE |
RAVE system
varying ex-port height by pneumatically controlled valve |
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MAX. POWER / TORQUE |
over 80HP at 12,000rpm / over 4.5kgm at 11,500rpm |
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CARBURETTOR |
2 Dell'Orto VHSB flat valve carburettors |
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IGNITION |
CDI digital, made by ROTAX
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GEARBOX |
extractable 6 speeds |
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CLUTCH |
dry multiple discs |
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FRAME |
twin spar alluminium
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SUSPENSIONS |
FRONT |
upside-down telescopic fork (White Power)
inner-tube diameter: ø40mm / stroke: 120mm
adjustable spring pre-load, compression and rebound damping |
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REAR |
swing-arm and mono-shock (White Power) with linkage
adjustable spring pre-load, compression and rebound damping |
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BRAKES |
FRONT |
disc: carbon-composite or cast-iron (ø280mm)
caliper: Brembo 4 pistons |
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REAR |
disc: alluminium disc plated by cast-iron (ø190mm)
caliper: Brembo 2 pistons |
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WHEELS |
FRONT |
3.50-17 (Marchesini, magnesium alloy) |
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REAR |
5.00-17 (Marchesini, magnesium alloy) |
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DIMENSIONS |
length × width: 1970 × 490mm
seat height: 770mm
road clearance: 130mm
weight: 91.5kg
wheel base: 1350mm
fuel tank capacity: 23 litres |