Spec Sheet
The information below is specific to the Norton - Mercury 650 68-70, showing anything for service information to the amount of fork oil or even the tyre pressures. If you would like to contribute any missing information, please use the edit link below.
Back.Norton - Mercury 650 68
Bike Info
CC:
647
Service
Tyre Pressure Back Bar / psi:
24 psi
Tyre Pressure Front Bar / psi:
24 psi
Valve Adjustment Interval:
5000 miles
Valve Clearance Cold - Exhaust:
.008"
Valve Clearance Cold - Inlet:
.006"
Brakes
Front:
Drum
Rear:
Drum
Dimensions
Dry Weight:
408 lbs
Fuel Capacity:
2.5 gallons UK
Electrics
Voltage:
12v
Charging System:
Alternator
Ignition:
coil
Ignition Timing:
32 deg at full advance
Spark Plugs:
Champion N5
Engine
Type:
Air Cooled 4 Stroke OHV Parallel Twin
Bore x Stroke:
68x89
Carburation:
30mm x 1
Carburation Idle Jet:
25
Carburation Main Jet:
280
Compression Ratio:
9:1
Displacement:
646 cc
No. of Valves:
2/cyl
Starting:
kick
Valve Train:
OHV
Transmission
Chain type:
5/8" x 1/4" x 97 rollers
Gearchange Pattern:
1 up 3 down
Gear Ratio 1st:
11.6
Gear Ratio 2nd:
7.57
Gear Ratio 3rd:
5.52
Gear Ratio 4th:
4.53
Primary Drive:
chain
Sprocket front:
21
Transmission:
4 speed
Misc.
Exhaust:
twin
Frame:
Norton Slimline Featherbed
Number Produced:
700
Place of Manufacture:
England
Power
Max Power Output:
49.9 hp
Top Speed:
115 mph
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All information presented on the website is given to the best of our knowledge at the given time. All information is intended to only as a guide. A major Japanese manufacturer's quote:
We reserve the right to vary our specification with or without notice, and as such time and in such manner as we think fit.