Tomos A31988 - Technical Data

Classic Cycles Technical Resources
2
TECHNICAL DATA
Engine
Single cylinder, two stroke, air cooled
Bore x stroke
38 x 43 mm (1.496 x 1.693 in)
Piston displacement
49 cm
3
(2.990 in
3
)
Compression ratio
8.5 : 1
Engine output
0.75 -1.5 KW
Gear box
automatic 2-steps, with two centrifugal clutches
Ignition
Flywheel magneto
Ignition advance
1.8-2 mm B.T.D.C.
Contact breaker gap
0.35-0.45 mm (0.014-0.018 inches)
Spark plug gap
0.5 mm (0.020 inches)
Spark plug
NGK B6HS, Champion L86, Bosch W 4 AC
Fuel
Mixture of 86 octane gasoline and two stroke oil (2%, or 50:1)
Gearbox oil/ quantity
Valvomatic type A Suffix A – SAE 10W30 / 220 cm
3
Front tire pressure
21 psi
Rear tire pressure
31 psi
Gearbox ratio (I)
17: 74, i = 4.3352
Gearbox ratio (II)
26: 64, i = 2.462
Main shaft
11: 71, i = 6.455
Secondary transmission
chain 90-93 rollers, i = 0.846 – 0.923
Crankshaft out-of-round deflection
max 0.01-0.02 mm
Magneto flywheel deflection
max aksialno 0.1mm
max radialno 0.3mm
Clutch drum axial play
0.1-0.3 mm