Technical Data

A

GEARBOX

Ball journal bearings:

Mainshaft (Clutch end) Ball journal 1 1/4 in. x 2 1/2 in. x 5/8 in.
Mainshaft (K/S end): Ball journal 5/8 in. x 9/16 x 7/16 in.
Layshaft (Clutch end): Ball journal 17 mm x 40 mm x 12 mm

Reductions

4th (HIGH): 1:1
3rd: 1.21 :1
2nd: 1.70 :1
1st (LOW): 2.56:1

Theoretical road speeds using various countershaft (gearbox) sprockets

Table assumes standard sprockets:

Engine 26T

Clutch 57T

Rear 42T

Engine RPM	Sprocket Teeth	19	20	21	22	23
	Overall Gear Ratio	4.84	4.60	4.38	4.18	3.99
	6000	92	97	102	106	112
	6500	99	105	110	115	121
	7000	107	113	119	124	130

Overall Ratios

With 19T Gearbox

With 21T Gearbox

Sprocket

Sprocket

4th (HIGH):

4.84:1

4.38:1

3rd:

5.90:1

5.30:1

2nd:

8.25:1

7.45:1

1st (Low):

12.40:1

11.20:1

No. of tecth on pinions

Layshaft: 4th 14t
Layshaft: 3rd 20t
Layshaft: 2nd 24t
Layshaft: 1st 28t
Mainshaft: 4th 23t
Mainshaft: 3rd 21t
Mainshaft: 2nd 18t
Mainshaft: 1st 14t

Gearbox

High gear bush O.D.: 0.9060/0.9053 in. (23.012/22.995 mm)
High gear bush l.D.: 0.8145/0.8140 in. (20.688/20.675 mm)
High gear bush fitted l.D.: 0.8133/ .8120 in. (20.657/20.625 mm)
Layshaft bush l.D.: 1.126 in./1.124 in. (28.60/28.549 mm)
Mainshaft second gear bush fitted l.D.: 0.8125/0.8115 in. (20.637/20.608 mm)
Layshaft third gear bush fitted l.D.: 0.8125/0.81 in. (20.637/20.57 mm)
Layshaft first gear bush fittod l.D.: 0.6885/0.6875 in. (17.488/17.462 mm)
Footchange spindie bush, K/S case fitted l.D.: 0.6290/0.6285 in. (15.976/15.964 mm)
Camplate/Quadrant bush fitted l.D.: 0.5005/0.4995 in. (12.713/12.687 mm)
K/S spindie bush fitted l.D.: 0.675/0.673 in. (17.145/17.094 mm)
Gearbox sprocket: 19T Standard

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