Technical Specifications; Engine; Ignition System; Transm Ission - Royal Enfield THUNDERBIRD 350 Owner's Manual

ENGINE

Engine Type ............. Single Cylinder 4 Stroke,
............................. Twinspark, Air cooled
Bore ............................ 70mm
Stroke ......................... 90mm
Swept volume .......... 346cc
Compression ratio . 8.5:1
Max Power ..................... 19.8 bhp @ 5250 rpm
Max Torque .................... 28 Nm @ 4000 rpm
Idle RPM .................... 1050+200
Starting ...................... Kick Start / E-Start
Air filter element .... Paper element
Lubrication ............... Wet sump
Engine oil capacity 2.75 litres (First Fill only)
.............................
2.30 to 2.50 litres (subsequent refills)
Engine oil grade .... Royal Enfield 15W50 API SL
............................. Grade & above, (JASOMA2)
Fuel Supply ............... 29mm, Constant Vacuum Carburetor
Cooling ...................... Natural air flow

IGNITION SYSTEM

Ignition system ........ Digital Dual Spark Ignition,
............................. TCI System
Spark plug Electrode gap WQR8DC : 0.80 to 0.90 mm
............................. UR6DC
Spark plug ............... WQR8DC M14 (Bosch) &
............................. UR6DC M10 (Bosch)

TRANSM ISSION

Clutch ......................... Wet multiplate (6 plates)
Primary drive .......... Duplex chain
Primary ratio ........... 2.15 : 1
Gear box .................. Constant Mesh, 5 Speed
Gear Ratio ................ 1 3.06:1
st
............................. 2 nd 2.01:1
............................. 3 1.52:1
rd
............................. 4 th 1.21:1
............................. 5 th 1:1
Final drive ................ 16 Teeth (Sprocket)
Final Ratio ................. 2.375:1
Drive Chain links .... 102 links
5
: 0.70 to 0.80 mm
2.375:1