Technical specification - Thunderbird Twinspark

Engine Type : Single Cylinder four stroke O.H.V. Dual Spark Ignition, Air cooled
Displacement : 346 cc
Valve : Two valve
Lifters : Hydraulic type
Starting : Self / Kick with automatic de-compressor
Starter Motor : 12 Volt 700 W
Bore x Stroke : 70mm x 90mm
Compression ration : 8.5:1
Max B.H.P : 19.8 @ 5250 rpm
Max Torque : 28 NM @ 4000 rpm
Engine Oil Grade : 15 - 50 API SL Grade
Sump Capacity : 2.75ltr.
Lubrication : Forced (Trochoid Type)
Carburettor : Ucal BS29
Air cleaner : Dry Paper type element
Transmission : 5Speed (1 down 4 up)
Clutch : 6 Plate Oil bath
Primary Drive : Duplex chain with auto tensioner
Secondary Drive : Chain
Secondary Drive Ratio : 1:2.53
Drive sprocket : 15 teeth
Driven Sprocket : 38 teeth
Battery : 12 Volt 14Ah
Headlamp : 12 Volt 35 / 35 W (Halogen)
Tail Lamp : 12 Volt 5 W
Stop Lamp : 12 Volt 21 W
Indicator : 12 Volt 10 W
Alternator : 18 Pole 220 Watts.
Ignition : TCI Twin spark
Ignition coil : 12 MJ x 2No.
Spark plug : W5DC & UR5DC
Front Fork : Telescopic 130mm travel
Rear : Gas filled Twin Shockers
Brake (F) : 280mm Hydraulic disc
Brake (R) : 150mm Drum type (6 inch)
Wheels : 19mm Spoked
Tyre (F) : 3.25 x 19" 6/4PR
Tyre (R) : 3.50 x 19" 6/4PR
Wheel base : 1370mm
Overall length : 2120mm
Overall width : 780mm
Overall Height : 1080mm
Seat Height : 770mm
Ground clearance : 135mm
Weight : 182 Kg