SR 50 Specs
Engine: Liquid cooled horizontal single cylinder two stroke. Electronic direct fuel injection.
Bore x Stroke: 40 x 39.3 mm
Total displacement: 49 cc
Compression ratio: 11.5:1
Ignition: High power inductive ignition
Generator: Flywheel-magneto, 165 W - 12 V.
Gear box: Continuous automatic variator
Clutch: Automatic centrifugal dry clutch
Primary drive: V belt
Final drive: Gears in oil bath.
Frame: Split single cradle frame in high tensile strength steel tube
Front suspension: Hydraulic fork, 90 mm wheel travel
Rear suspension: Engine unit acting as swingarm; frame linkages on two radial silent block mountings; wheel travel 70 mm. Rear: 190 mm stainless steel disc; racing caliper with twin opposed 30 mm pistons
Brakes: Front Brake 7.5" stainless steel disc; racing caliper with twin opposed 1.3" pistons Rear Brake 7.5" stainless steel disc; racing caliper with twin opposed 1.2" pistons
Wheels: Five spoke, light alloy wheels front and rear: 3.50 x 13"
Tyres: Tubeless. Front and rear: 130/60 x 13"
Dimensions: Overall length: 1860 mm Overall width: 705 mm Overall height: 1120 mm Seat height: 32.2" Wheelbase: 50.78"
Fuel tank capacity: 1.85 gals
Intake: Reed valve
Other: Fuel injection Electronically controlled, air assisted, direct injection into the combustion chamber. Injector type EFI low flow injector. Direct injection system External opening, SMD 8 micron medium spray. Pressure regulator Pressure differential maintained at 2.5 bar. Throttle body Ø 18 mm throttle body with integrated TPS (Throttle Position Sensor). Air compressor Driven off crankshaft, lubricated by air-oil mix in crank chamber. Fuel pump 6.5 - 8 bar, high pressure pump with low electrical power absorption, < 0.5 A. Electronic Control Unit 8 Hz clock speed, 22 pin.