MODEL DESIGNATIONS:
1969 Triumph Bonneville T120C.....................
Scrambler
1969 Triumph Bonneville T120R.....................
Roadster
ENGINE:
Engine type.......................................
OHV vertical twin
Horsepower at RPM............................ 49
BHP @ 6,200 rpm
Bore................................................
71mm / 2.79"
Stroke.............................................
82mm / 3.23"
Displacement....................................
649cc / 40 cu. in.
Compression Ratio.............................
9.0:1
Valve Clearance (cold):
Inlet................................................
0.05mm / 0.002"
Exhaust............................................
0.10mm / 0.004"
Valve Timing:
Inlet Valve Opens..............................
34 degrees BTDC
Inlet Valve Closes..............................
55 degrees BTDC
Exhaust Valve Opens.......................... 55
degrees BTDC
Exhaust Valve Closes..........................
27 degrees BTDC
IGNITION:
Ignition Breaker Gap.............................
0.4mm / 0.015"
Spark Plug Gap..................................
0.50mm / 0.020"
Timing (static).................................14
degrees BTDC
Timing (fully advanced):........................
38 degrees BTDC
CARBURETORS:
Type................................................
Amal Concentric
Throat Size.......................................
30mm
Main Jet...........................................
210
Needle Jet........................................
.107
Needle Position..................................
2
Needle Type.......................................D
Throttle Valve....................................
2
Pilot Jet............................................
25
TRANSMISSION:
Speeds..............................................
4
Gear Ratios:
4th - Top...........................................
5.84
3rd - Third.........................................
6.76
2nd - Second......................................
8.17
1st - Bottom......................................
11.8
CLUTCH:
Type................................................
Multi-plate, wet
Number of Plates:
Drive Plates......................................
6
Driven Plates....................................
6
SPROCKETS:
Engine.............................................
29 teeth
Clutch.............................................
58 teeth
Gearbox..........................................
19 teeth
Rear Wheel......................................
47 teeth
CHAIN:
Primary, pitch..................................
3/8" triplex
Primary, length.................................
84 links
Final Drive, pitch...............................
5/8" X .400" X 3/8"
Final Drive, length.............................
106 links
CAPACITIES:
Fuel (US versions).............................
2.5 Imp. gal.
Fuel (UK & export versions).................
4 Imp. gal.
Oil Tank...........................................
5 pints / 3 L
Gearbox...........................................
1 pt / 500cc
Primary Chaincase.............................
1/4 pt / 150cc
Front Forks.......................................
6.4 oz. / 190cc
TIRES:
Front...............................................
3.25 X 19"
Rear................................................
4.00 X 18"
SUSPENSION:
Front...............................................
Telescopic Forks
Rear................................................
Swing Arm
BRAKES:
Front...............................................
8" / 20.32cm TLS
Rear................................................
7" / 17.78cm SLS
DIMENSIONS:
Seat Height......................................
32.5" / 77.5cm
Wheelbase........................................
54.5" / 140.3cm
Length..............................................
85.5" / 202cm
Width...............................................
28.5" / 72cm
Ground Clearance..............................
5" / 12.7cm
Weight, unladen................................
363 lbs / 165kg
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Version: 02.01.14