Triumph 350, 500 Unit Twins Manual Every manual is written from hands-on experience based on a complete tear down, the step-by-step procedure of dismantling a particular vehicle part-by-part. Hundreds of photographs accompany each manual's step-by-step instructions. The books are written from the actual experience of Haynes' own expert personnel using only a basic set of tools and presented in a style that any DIY'er can follow, even a beginner.
| 1957 | Triumph | 350 |
| 1958 | Triumph | 350 |
| 1959 | Triumph | 350 |
| 1960 | Triumph | 350 |
| 1961 | Triumph | 350 |
| 1962 | Triumph | 350 |
| 1963 | Triumph | 350 |
| 1964 | Triumph | 350 |
| 1965 | Triumph | 350 |
| 1966 | Triumph | 350 |
| 1967 | Triumph | 350 |
| 1968 | Triumph | 350 |
| 1958 | Triumph | 500 |
| 1959 | Triumph | 500 |
| 1960 | Triumph | 500 |
| 1961 | Triumph | 500 |
| 1962 | Triumph | 500 |
| 1963 | Triumph | 500 |
| 1964 | Triumph | 500 |
| 1965 | Triumph | 500 |
| 1966 | Triumph | 500 |
| 1967 | Triumph | 500 |
| 1968 | Triumph | 500 |
| 1969 | Triumph | 500 |
| 1970 | Triumph | 500 |
| 1971 | Triumph | 500 |
| 1972 | Triumph | 500 |
| 1973 | Triumph | 500 |
M137 Haynes
