Honda 126ci specs: 83 x 95 mm (3.2677 x 3.7402 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 126 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.268" |
| Stroke | 3.740" |
| Advertised power | 140 hp |
| Years | 1990–1991 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| B21A1 | 126 ci | 3.2677" × 3.7402" | — | 140 |
This family is represented by a single engine in the database: 126 ci, 4 cylinders, a 3.2677" × 3.7402" 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.