Ok, I have a program to do this, you can have it if you like, but here goes:
Crank Sprocket 52
Clutch Sprocket 83 = Primary reduction ratio 1.6 to 1
Drive Sprocket 17
Rear Sprocket 40 = Secondary reduction ratio 2.35 to 1
Final drive ratio 3.76 to 1
Primary ratio * Secondary ratio = Final ratio
1.6 * 2.35 = 3.76
1st gear ratio 2.615
2nd gear ratio 1.937
3rd gear ratio 1.526
4th gear ratio 1.284
5th gear ratio 1.136
6th gear ratio 1.043