B25 General.




SPECIFICATIONS
ENGINE TYPE	OHV
CYLINDERS	1
BORE/STROKE mm	67 X 70
CAPACITY cm3	247
DRY WEIGHT KG	131
BHP	23





Engine: Light alloy cylinder head, alloy barrel with liner.
Comp ratio: 10:1. Carburettor: Amal R928.
Valve clearances
Intake: 0,20 mm ( 0,008 in ).
Exhaust: 0,25 mm ( 0,010 in ).

Gearbox: Four speeds. Multiplate clutch with bonded composite
segments and built-in transmission shock absorber.
Gearbox Ratios.
First: 2:65.
Second: 1:64.
Third: 1:24.
Top: 1:00.
Capacities
Gearbox: 280 cm3 (1/2 pint UK, 5/8 pint USA )
Primary Chaincase: 140 cm3 (1/4 pint UK, 1/3 pint USA )

Brakes: Front 6" single leading shoe drum brake.
Rear 7" brake drum with floating cams.

Electrical: 12 volt ignition system. Crankshaft mounted alternator.
(Lucas RM21 115 watt). Spark plug: N3. Spark timing, degrees fully advanced: 37

Frame: Welded frame with large diameter top tube for
strength. Top tube doubles as oil container (OIF). Roller
steering head bearings. Needle bearing swinging arm with
quadrant adjustment for rear chain.

Chain sizes: Front: 3/8 pitch (duplex). Rear: 5/8 pitch X 1/4 Wide.

Dimensions B25SS and B25T

Overall length:       2160mm (85in).
Wheelbase:             1372mm (54,0 in).
Ground clearance: 178mm (7,0 in).
Seat height:             813mm (32,0 in).
Overall width:         737mm (29,0 in).
Overall height:       1105mm (43,5 in).
Dry weight:              131 Kg (290,0 lbs). B25T 127 Kg (287,0 lbs).






Updated 1999-12-15
© Rickard Nebrér