Dean, Paul «Service: Oil miser». Cycle World. Hachette Filipacchi Media [[[Newport Beach, California|Newport Beach]], CA USA], 44, 5, 5-2005, pàg. 160. ISSN: 0011-4286 [Consulta: 26 maig 2013]. «An air-cooled big-bore V-twin in particular can get very hot, especially the rear cylinder, which is not exposed to as much cooling air as the front.»
worldcat.org
Dean, Paul «Service: Oil miser». Cycle World. Hachette Filipacchi Media [[[Newport Beach, California|Newport Beach]], CA USA], 44, 5, 5-2005, pàg. 160. ISSN: 0011-4286 [Consulta: 26 maig 2013]. «An air-cooled big-bore V-twin in particular can get very hot, especially the rear cylinder, which is not exposed to as much cooling air as the front.»