Cylinder head collar nut M7x1mm. Yamaha YH 50 Why 5FV1 1999. Yamaha YH 50 Why 5FV3 2000. Yamaha YH 50 Why 5FV5 2001. Yamaha YH 50 Why 5PF3 2002. Yamaha YH 50 Why 5XS1 2003. Yamaha YH 50 Why 5UB3 2004.
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