| Engine | Displacement | Power output (max.) |
| SINGLE CYLINDER |
| BT-series |
| 161F | 123 cc (7.5 cu.in.) | 3.0 HP at 3,600 rpm |
| 168FA(E) | 163 cc (9.95 cu.in.) | 4.5 HP at 3,600 rpm |
| 168FB(E) | 196 cc (11.96 cu.in.) | 5.0 HP at 3,600 rpm |
| 170F(E) | 208 cc (12.7 cu.in.) | 5.5 HP at 3,600 rpm |
| 173F(E) | 243 cc (14.83 cu.in.) | 6.5 HP at 3,600 rpm |
| 177F(E) | 270 cc (16.5 cu.in.) | 9.0 HP at 3,600 rpm |
| 182F(E) | 338 cc (20.6 cu.in.) | 9.0 HP at 3,600 rpm |
| 188F(E) | 389 cc (23.7 cu.in.) | 10.0 HP at 3,600 rpm |
| 190F(E) | 420 cc (25.6 cu.in.) | 10.5 HP at 3,600 rpm |
| GB-series |
| GB160 | 163 cc (9.95 cu.in.) | 4.3 HP at 3,600 rpm |
| GB200 | 196 cc (11.96 cu.in.) | 5.6 HP at 3,600 rpm |
| GB200A | 196 cc (11.96 cu.in.) | 5.5 HP at 3,600 rpm |
| GB200S | 196 cc (11.96 cu.in.) | 5.5 HP at 3,600 rpm |
| GB210 | 208 cc (12.69 cu.in.) | 6.0 HP at 3,600 rpm |
| GB225 | 223 cc (13.62 cu.in.) | 6.0 HP at 3,600 rpm |
| GB270 | 272 cc (16.60 cu.in.) | 8.0 HP at 3,600 rpm |
| GB420S | 420 cc (25.63 cu.in.) | 12.5 HP at 3,600 rpm |
| GB620 | 625 cc (38.14 cu.in.) | 19.0 HP at 3,600 rpm |
| GB680 | 679 cc (41.44 cu.in.) | 20.0 HP at 3,600 rpm |
| GB750S | 750 cc (45.8 cu.in.) | 22.0 HP at 3,900 rpm |
| GB1000S | 999 cc (61.0 cu.in.) | 33.0 HP at 3,900 rpm |
