| Engine | Displacement | Power output (max.) |
| SINGLE CYLINDER |
| HORIZONTAL SHAFT |
| B-series |
| 1B20 | 243 cc (14.83 cu.in.) | 4.7 HP at 3,600 rpm |
| 1B27 | 280 cc (17.09 cu.in.) | 5.4 HP at 3,600 rpm |
| 1B30 | 347 cc (21.18 cu.in.) | 7.2 HP at 3,600 rpm |
| 1B40 | 462 cc (28.19 cu.in.) | 10.1 HP at 3,600 rpm |
| 1B50 | 517 cc (31.55 cu.in.) | 11.4 HP at 3,600 rpm |
| VERTICAL SHAFT |
| B-series |
| 1B20V | 243 cc (14.83 cu.in.) | 4.7 HP at 3,600 rpm |
| 1B30V | 347 cc (21.18 cu.in.) | 7.2 HP at 3,600 rpm |
| 1B40V | 462 cc (28.19 cu.in.) | 10.1 HP at 3,600 rpm |
| 1B50V | 517 cc (31.55 cu.in.) | 11.4 HP at 3,600 rpm |
