RD 500 LC YPVS

Description

The Yamaha RD500LC is a high-performance. nbsp;two-stroke sports motorcycle. also known as the RZ500 in Canada and Australia. A lightened but detuned version known as the RZV500R was developed for the Japanese home market. Engine[edit]

The RD500LC uses a 50-degree. twin-crankshaft V4 engine layout. Linked Yamaha YPVS exhaust power valves are controlled by a single electronic unit and servo motor and are designed to give a broader power band. The engine also features intake reed valvesunlike the YZR500 racer which used rotary disc valve induction. The reed valves use two different intake arrangements. the lower cylinders are fed through crankcase mounted reeds; the upper pair use cylinder barrel mounted reeds. The four Mikuni carburettorsare side mounted in pairs and feed each cylinder through 90 degree intake manifold. The lower expansion chambers exit normally but the upper pipes cross over each other just behind the exhaust ports to maintain the correct tuned length.

The dual crankshafts are geared directly to the clutch. while the front crankshaft also drives a counter balancer shaft mounted between the two crankshafts. The counterbalance shaft. unusual on a two-stroke. assists with dampening engine vibrations. The engine is cooled by thermostatically controlled liquid cooling. an auxiliary electric fan mounted behind the radiator cuts in at high temperatures (e. g. when stationary in traffic).  Lubrication is by direct injection in to the inlet manifolds using Yamaha's 'Autolube' pump system. Normally controlled in other two-stroke engines by throttle position. the engine oil pump is controlled by the YPVS servo motor ensuring that the oil supply is not shut off at high engine revolutions. [1][2]

Transmission[edit]

The RD500LC uses a six-speed sequential close ratio gearbox. the gear shafts are removable from the right side of the engine without the need to split the crankcases. The clutch is of the wet. multiple-disc coil spring type and is cable operated. Unusually for a two-stroke engine the gears and outer crankshaft bearings are lubricated by a separate crankshaft driven troichoid oil pump. Final drive is by O-ring chain and sprockets.

Chassis[edit]

The frame of the RD500LC is manufactured from mild steel box-section and uses a perimeter layout. The rear shock absorber is unusually placed horizontally under the engine and uses the lower crankcase as a mounting point. The under-seat area is occupied by the upper cylinder exhaust chambers. the battery and the YPVS servo motor. The rear of the shock absorber connects to an extrudedaluminium alloy swinging arm via several forged aluminium rocker arms. An unusually small diameter 16-inch wheel is held between 37 mm (1. 5 in) spring and oil damped forks which featured adjustable anti-dive units.

The RD500LC uses twin ventilated disc brakes for the front wheel with a single ventilated disc at the rear. A solo seat cowl was originally provided to cover the pillion seat when not in use. [1]

Electrical system[edit]

The RD500LC features a standard 12 volt electrical system. Yamaha's self-cancelling indicator unit is used and a variable resistance gauging system is used to monitor two-stroke oil tank contents with associated warning lights.  Nippondenso capacitor discharge ignition (CDI) is used in conjunction with two coils. [3]

Specifications (RD500LC/RZV500R)[edit]RD500LC[1][3]RZV500R[1][3]Engine499 cc (30 cu in). 2-stroke. four-cylinder. liquid-cooled. reed valve induction with YPVSBore Stroke56. 4 mm ?— 50. 0 mm (2. 22 in ?— 1. 97 in)Compression Ratio6. 6:1Fuel SystemMikuni VM26SS 26 mm (1. 0 in) carburettor x 4LubricationYamaha Autolube two stroke injection. transmission gear pump. IgnitionCapacitor Discharge Ignition (CDI)Transmission6-speed. constant meshFinal Drive530 chain. 102 linksOverall Length2. 85 mm (82. 1 in)Overall Width705 mm (27. 8 in)Overall Height1. 45 mm (45. 1 in)Seat Height780 mm (30. 7 in)Ground Clearance145 mm (5. 7 in)Wheelbase1. 75 mm (54. 1 in)Dry Weight205 kg (452 lb)196 kg (432 lb)Suspension FrontTelescopic. coil spring. non adjustable spring preload. brake linked anti-dive systemTelescopic. air assisted coil spring. adjustable spring preload. adjustable rebound damping with brake linked anti-dive systemSuspension RearLink-type. gas/oil damped. 5-way adjustable spring preload. 4-way adjustable rebound dampingBrakes FrontDual hydraulic discBrakes RearSingle hydraulic discTires Front120/80-VR16Tires Rear130/80-VR18Fuel Tank Capacity22 L (6 US gal; 5 imp gal)http://en. wikipedia. org/wiki/Yamaha_RD500LC

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