| Secondary shaft | Primary shaft | ratio | |
| 1th gear | 10 teeth | 36 teeth | 1:3,6 |
| 2th gear | 14 teeth | 32 teeth | 1:2,28 |
| 3th gear | 17 teeth | 29 teeth | 1:1,7 |
| 4th gear | 20 teeth | 26 teeth | 1:1,3 |
| backwards | 17 teeth | 33 teeth | 1:1,94 |
| sets 4th gear “long” available http://www.oldtimergarage.eu | 21 teeth | 25 teeth | 1:1,19 |
| 22 teeth | 24 teeth | 1:1,09 | |
| 23 teeth | 23 teeth | 1:1 | |
| set 3th gear “long” advised in combination with “long” 4th | 18 teeth | 28 teeth | 1:1,55 |
Remark: There’s also a gearbox with more “ribs” on the front, 5 instead of 3 and an different indirect shaft with 9 teeth and cogwheel with 37 teeth on the main shaft —– first gear ratio 1:4,12 If anyone has more info about it plz. share with us here !!
According to Ural Hamburg, the indirect shaft with 10 teeth first gear is early and the indirect shaft with 9 teeth for the first gear is from a later period !
Changing cogs with no fancy tools, just some heat, pulley puller and a bearing puller. I changed the cogs, old 3th 17-29 and old 4th 20-26 into 18-28 and 21-25.
3 different types of casing, for oil bath air filter MT9-10 and 2 types for air filter MT11-16
Not all with 4 speed with reverse and semi automatic clutch !
There were also solo MT804 gearboxes, which came with the reverse (backwards 🙂 gear completely omitted. No reverse gear and no hole drilled in the casing for the reverse hand lever.
