Wiseco W5493 Top End Gasket Kit Fits: Yamaha Tri Z 250 1985-89 Contains all the necessary gaskets and O-rings to rebuild your top end Wiseco gasket kits are made from the highest quality materials and engineered by Wiseco to ensure compatibility with Wiseco pistons and crankshafts Each gasket kit is sourced in-house to find the most reliable, high quality suppliers available Ensures a critical seal and superior durability that meets and exceeds OEM specifications