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The term "Suzuki 650 fours" refers toThe term "Suzuki 650 Fours" or "GS650 Fours" is a reference from the [http://www.amazon.ca/Suzuki-Gs650-Fours-1981-1983-Maintenance/dp/0892873671 Clymer motorcycle manual] and by some [http://www.umgweb.com/member1/sgs55652.htm Suzuki enthusiasts].