Honda 137ci specs: 86 x 97 mm (3.3858 x 3.8189 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 137 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.386" |
| Stroke | 3.819" |
| Compression | 9.3:1 |
| Advertised power | 150 hp |
| Years | 1998 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| F23A7 | 137 ci | 3.3858" × 3.8189" | 9.3:1 | 150 |
This family is represented by a single engine in the database: 137 ci, 4 cylinders, a 3.3858" × 3.8189" bore and stroke.
All are undersquare — stroke larger than bore, favouring torque low in the range.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.