WOSSNER PISTON KIT YAMAHA YZ400F 1998-1999 / WR400F 1998-2000 13.5:1 CR 8639DA 125XC-F Use in combination with VHM

Use in combination with VHM head AA33151

When paired up with a Nihilo Clutch Basket

The new design brings the stock crank closer to a perfectly balanced system

AE32061-F (2004 - 2008)

Additional mud clearance grooves and weight reduction

WOSSNER PISTON KIT YAMAHA YZ400F 1998-1999 / WR400F 1998-2000 13.5:1 CR 8639DA 125XC-F Use in combination with VHMMade in Germany Part # 8639DA ALL PISTON KITS INCLUDE PISTON, RINGS, WRIST PIN, AND RETAINING CLIPS UNLESS NOTED. REPLACEMENT COMPONENTS LISTED BELOW ITEM BORE SIZE PISTON SIZE RING CLIP WRIST PIN 8639DA 92. 00 91. 95 920XSY CW18 WP053 SP 8639DB 92. 01 91. 96 920XSY 8639DC 92. 02 91. 97 920XSY