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Stormer Y4 250 Mk 2

Stormer Y4 250 Mk 2
Stormer Y4 250 Mk 2
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Specifications

General information
Year
1974
Engine and transmission
Engine type
1-cylinder, 2T
Power
25 HP
Max RPM
8000
Cooling system
Air
Transmission type,final drive
Chain
Displacement
247 cm³
Bore x stroke
68.0 x 68.0 mm
Fuel system
Carburettor. AMAL 32mm concentric
Gearbox
4-speed
Fuel control
Port control
Clutch
Wet plate Diaphram
Lubrication system
Pre-mix. Castrol R at 20:1
Compression
11.0:1
Ignition
flywheel magneto
Exhaust system
loud, expansion chamber
Chassis, suspension, brakes
Frame type
Double downtube, full cradle
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)
Front tyre
2.75-21
Rear tyre
4.00-18
Front suspension
Telescopic forks
Front brakes diameter
127 mm
Rear brakes diameter
127 mm
Front wheel travel
178 mm
Physical measures and capacities
Dry weight
104.3 kg
Power/weight ratio
0.2396 HP/kg
Fuel capacity
7.57 litres
Wheelbase
1.41 mm
Seat height
762 mm
Ground clearance
254 mm
Front percentage of weight
46.5
Rear percentage of weight
53.5
Other specifications
Starter
Kick
Color options
Orange tank, grey frame, black side panels