Would 09 gas tank fit 1998 kx80?

No, a 2009 gas tank is unlikely to fit a 1998 KX80, as the design and mounting points of motorcycle parts can vary significantly between different model years. The KX80 underwent various changes throughout its production, and the compatibility of parts typically only extends to the same generation or model year. It's best to find a gas tank specifically designed for the 1998 KX80 to ensure proper fitment and functionality.