Engine & frame numbers for Triumph single cylinder vintage motorcycles including the following models, 2/1, 2/5, 3/1, 3/2, 3/5, 5/1, 5/2, 5/3, 5/4, 5/5, 5/10, 6/1, XO5, XO7.
I have compiled a series of tables to show the generally accepted information on the engine and frame numbers for Triumph motorcycles. This table shows data specifically for the veteran Triumph single cylinder motorcycles for 1934.
Single cylinder models, 1934
| Model | Prefix |
|---|---|
| 2/1 (250cc) | prefix 1R4 |
| 2/5 (250cc) | prefix 5R4 |
| 3/1 (350cc) | prefix IT4 |
| 3/2 (350cc) | prefix 2T4 |
| 3/5 (350cc) | prefix 5T4 |
| 5/1 (500cc) | prefix 1S4 |
| 5/2 (500cc) | prefix 2S4 |
| 5/3 (500cc) | prefix 3S4 |
| 5/4 (500cc) | prefix 4S4 |
| 5/5 (500cc) | prefix 5S4 |
| 5/10 (500cc) | prefix 1 OS4 |
| 6/1 (650cc) | prefix 1 V4 |
| Model XO5 (150cc) | XO as prefix or suffix to engine numbers |
| Model XO7 (175cc) | XO7 as prefix or suffix to engine numbers |
If you are looking for a Triumph part, it may be worth looking at this page. If I have anything, that’s where it will be. You will need to look for the Triumph parts among the other early parts.
If you are looking to sell, or seeking a specific part, let me know here. I will do my best to help.
