• May 25, 2026 Norton Twins Owners Manual Models Covered 497cc Model 7 1949 1956 497cc Model 88 1951 1963 597cc Model 99 1956 1966 597cc Model 77 1957 1959 1968 1970 745cc Ranger P11a 1967 1968 s under the British sun, and the rumble of a well-tuned engine is the soundtrack to a life lived with passion and purpose. This is no dry recitation of torque settings and valve clearances. Instead, the authors have woven a narrative so engaging that each page feels like a chapter in an epic sa By Dr. Don Schuppe