[1] After his motorcycle riding career, he became race team manager for world championship winning riders Kenny Roberts and Eddie Lawson.

[2] Carruthers, as the son of a motorcycle shop owner, learned how to work on bikes from a young age, started riding at 10, and entered his first race at 12.

After the Isle of Man TT, Aermacchi released him from their contract to continue as a factory rider with Benelli and, he went on to win the 1969 FIM 250cc road racing world championship after a tight points battle with Santiago Herrero and Kent Andersson.

[5] He had also become team manager, crew chief, as well as a rider coach for his younger Yamaha teammates, Kenny Roberts, Don Castro and Gary Fisher.

[2] Source:[1][9] Points system from 1950 to 1968: Points system from 1969 onwards: (key) (Races in bold indicate pole position; races in italics indicate fastest lap) 1949  B. Ruffo 1950  D. Ambrosini 1951  B. Ruffo 1952  E. Lorenzetti 1953  W. Haas 1954  W. Haas 1955  H. Müller 1956  C. Ubbiali 1957  C. Sandford 1958  T. Provini 1959  C. Ubbiali 1960  C. Ubbiali 1961  M. Hailwood 1962  J. Redman 1963  J. Redman 1964  P. Read 1965  P. Read 1966  M. Hailwood 1967  M. Hailwood 1968  P. Read 1969  K. Carruthers 1970  R. Gould 1971  P. Read 1972  J. Saarinen 1973  D. Braun 1974  W. Villa 1975  W. Villa 1976  W. Villa 1977  M. Lega 1978  K. Ballington 1979  K. Ballington 1980  A. Mang 1981  A. Mang 1982  J. Tournadre 1983  C. Lavado 1984  C. Sarron 1985  F. Spencer 1986  C. Lavado 1987  A. Mang 1988  S. Pons 1989  S. Pons 1990  J. Kocinski 1991  L. Cadalora 1992  L. Cadalora 1993  T. Harada 1994  M. Biaggi 1995  M. Biaggi 1996  M. Biaggi 1997  M. Biaggi 1998  L. Capirossi 1999  V. Rossi 2000  O. Jacque 2001  D. Kato 2002  M. Melandri 2003  M. Poggiali 2004  D. Pedrosa 2005  D. Pedrosa 2006  J. Lorenzo 2007  J. Lorenzo 2008  M. Simoncelli 2009  H. Aoyama 2010  T. Elías 2011  S. Bradl 2012  M. Márquez 2013  P. Espargaró 2014  T. Rabat 2015  J. Zarco 2016  J. Zarco 2017  F. Morbidelli 2018  F. Bagnaia 2019  Á. Márquez 2020  E. Bastianini 2021  R. Gardner 2022  A. Fernández 2023  P. Acosta 2024  A. Ogura