Scrambler (T20SR/T20SC)

Scrambler (T20SR/T20SC)

Two more versions on the 'Sports' Cub theme from 1962 to 1965, the SR (Road Sports) was the more road orientated machine with the SC (Competition Sports) being more off-road biased. They were real lightweight sports machines that averaged just 223 lbs (100 kg) on the scales.

"The Tiger Cub is a winner all the way" declared Belgium Trials and Scrambles Champion Roger Vanderbecken in one sales brochure.

 

Both models had all the performance parts fitted, 9:1 piston, 'R' cam, sport valve springs, crankcase undershield, heavyweight front forks, QD lights and speedometer, and the Lucas Energy Transfer Ignition to allow the machines to be used without a battery. Adjustable rear suspension units were listed for the 1965 models.

The T20SR had the option of a close-ratio or extra close-ratio gear cluster and had road tyres and a low level exhaust system. Conversely the T20SC model came with either standard-ratio or wide-ratio gears, trials tyres and high level exhaust (option of silencer or extension pipe). It was also listed with lightweight alloy front and rear mudguards and was also to form the basis of the T20M Mountain Cub.

Two-tone colour schemes:

1962:

Burgundy and Silver Sheen

1963:

Flamboyant Flame and Silver Sheen

1964:

Kingfisher Blue or Hi Fi Scarlet and Silver Sheen

1965 T20SR:

Pacific Blue and Silver Sheen

1965 T20SC:

Hunting Yellow option (not two-tone)

Specifications

Production T20SR

Started:

21st March 1962

Finished:

3rd February 1965

Numbers:

84967 to 1820

(not continuous)

Production T20SC

Started:

21st March 1962

Finished:

8th January 1965

Numbers:

84912 to 1541

(not continuous)

Engine

Type:

Single-cylinder OHV, unit construction

Capacity:

199cc (12.1 cu in)

Bore / Stroke:

63mm (2.480in) x 64mm (2.520in)

Compression:

9 : 1

7 : 1 West Coast USA models for 1965

Power:

16bhp (12.1 kW or 16.2 PS) @ 6700 rpm

Carburettor:

15/16 inch Amal Monobloc 376/272

376/314 West Coast T20SR for 1965

Camshaft:

'R' cam - valve clearances In 0.002in : Ex 0.004in (cold)

Clutch:

Wet multiplate

Gears:

4

Cycle Parts

Front Suspension:

Telescopic forks, hydraulic damped

Rear Suspension:

Swing-arm, twin shock absorbers

Front Wheel:

19 inch (WM1 rim)

Rear Wheel:

18 inch (WM2 rim)

18 inch (WM3 rim) (T20SC 1964/65)

Front tyre:

3.00 x 19

Rear tyre:

3.50 x 18

4.00 x 18 (T20SC 1964/5)

Brakes:

5.5 in dia. Single leading shoe drum front and rear

Petrol Tank:

2.625 UK gallons (3.15 US gallons or 11.92 litres)

Oil tank:

2.75 UK pints (3.3 US pints or 1.56 litres)

Gearbox:

1/3 UK pint (0.4 US pints or 0.19 litres)

Primary Chaincase:

1/3 UK pint (0.4 US pints or 0.19 litres)

Front Fork:

1/4 UK pint (0.3 US pints or 0.14 litres)

Electrics

Type:

Lucas Energy Transfer

Ignition Coil / Battery (West Coast T20SR 1965)

Voltage:

6

Charging Type:

Alternator / Rectifier

Ignition Timing:

20° BTDC static. 40° fully advanced

Points Gap:

0.014in - 0.016in

Spark Plug:

Champion L7 or equivalent

Spark Plug Gap:

0.020in

0.025in for battery models