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Yamaha, 80-175Cc Piston-Port, 1968-1976 : Service, Repair, Performance by Clymer

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Yamaha Yz50-80 Monoshock 1978-1990 Service Repair Maintenance by E. Scott, Ron Wright

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Yamaha Pw50 Y-Zinger, Pw80 Y-Zinger & Bw80 Big Wheel 1981-2002 (Clymer Motorcycle Repair) (Clymer Motorcycle Repair) (Paperback) by Clymer Publications

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Yamaha RX50K [L,N] Service Manual

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Yamaha YJ50RN Service Manual (Primarily For Use by Yamaha Scooter Dealers and Mechanics) (Paperback) by Yamaha Motor Company

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Yamaha service-repair handbook, 80-175cc Enduro & Motocross, 1968-1976

1850101302
Yamaha DT 50 & 80 trail bikes owners workshop manual by Chris Rogers

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Yamaha service-repair handbook, 80-175cc Enduro & Motocross, 1968-1976