Hyosung SF

From CycleChaos
Jump to navigation Jump to search


Hyosung-sf-2010-2010-0.jpg
Hyosung SF
Manufacturer
Also called SF50, SF 50, SF50 Racing, SF 50 Racing, SF50 Rally, SF 50 Rally, SF 50R Rally, SF50B, SF 50B, SF50B Prima, SF50R Rally
Production 2005 - 2011
Class Scooter
Engine
single cylinder, two-stroke
Bore / Stroke 41.0mm x 37.4mm
Compression ratio 7.2:1
Top Speed 28 mph (45 km/h)
Horsepower 4.83 HP (3.6 KW) @ 7000RPM
Torque 2.8 ft/lbs (3.8 Nm) @ 6500RPM
Fuel System carburetor
Ignition electronic
Transmission Gear box: automatic

Final Drive: belt

Clutch: centrifugal automatic clutch
Suspension Front: conventional telescopic
Rear: mono shock absorber (preload adjustable)
Brakes Front: single disc
Rear: expanding brake (drum brake)
Front Tire 110/70-12
Rear Tire 120/70-12
Wheelbase 2.01 inches (51 mm)
Length 72.4 inches (1839 mm)
Width 25.0 inches (635 mm)
Height 46.69 inches (1186 mm)
Seat Height 29.02 inches (737 mm)
Weight 194.01 pounds (88.0 Kg) (dry), 88.0 kg (wet)
Fuel Capacity 1.25 Gallon (4.73 Liters)
Manuals Service Manual


The Hyosung SF50B Prima was a single cylinder, two-stroke scooter produced by Hyosung between 2005 and 2011. It could reach a top speed of 28 mph (45 km/h). Max torque was 2.8 ft/lbs (3.8 Nm) @ 6500 RPM. Claimed horsepower was 4.83 HP (3.6 KW) @ 7000 RPM.

Engine[edit]

The engine was a air cooled single cylinder, two-stroke. A 41.0mm bore x 37.4mm stroke result in a displacement of just 49.0 cubic centimeters. Fuel was supplied via a overhead cams (ohc).

Drive[edit]

The bike has a automatic transmission. Power was moderated via the centrifugal automatic clutch.

Chassis[edit]

It came with a 110/70-12 front tire and a 120/70-12 rear tire. Stopping was achieved via single disc in the front and a expanding brake (drum brake) in the rear. The front suspension was a conventional telescopic while the rear was equipped with a mono shock absorber (preload adjustable). The SF50B Prima was fitted with a 1.25 Gallon (4.73 Liters) fuel tank. The bike weighed just 194.01 pounds (88.0 Kg). The wheelbase was 2.01 inches (51 mm) long.

2010 Hyosung SF50R Rally[edit]

2010 Hyosung SF50R Rally

The 2010 MY Hyosung SF50R Rally has, at its heart, an air-cooled, two-stroke, 49cc, single cylinder lump paired to a continuously variable transmission, that can produce 5 horsepower and 4 Nm of torque. Unlike its SF50B sibling, this machine has a more youthful, race-inspired visual appearance, with race decals and bold colors, and is sure to fit the taste of the more adventurous and young among riders. It comes standard with a dual seat, passenger grab rails, a front disc brake, and an under-storage compartment.


2010 Hyosung SF50B[edit]

2010 Hyosung SF50B

The 2010 MY Hyosung SF50B sports an air-cooled, two-stroke, 49cc, single cylinder powerhouse mated to a continuously variable transmission (CVT) and can produce 5 horsepower and 4 Nm of torque. Standard features include passenger pegs, a dual seat, a large under-seat storage compartment, a free flowing exhaust system, a modern instrumentation panel, and lightweight, cast-aluminum wheels.


2011 Hyosung SF50B[edit]

2011 Hyosung SF50B

The 2011 MY Hyosung SF50B sports an air-cooled, two-stroke, 49cc, single cylinder lump paired to a continuously variable transmission, and can produce 5 horsepower and 4 Nm of torque. This agile scooter is suitable for one's daily commute inside the concrete jungle, being easy-to-park, fuel-efficient and capable of tackling narrow alleyways. It comes standard with passenger pegs, a two-up seat, passenger grab rails, an under-seat storage compartment and 12" wheels.