outlaws Justice

Investigating problems with the 1978 Yamaha XS500. Currently know of one locally with about 25,000 miles and it has a 100 percent leak down one cylinder. Seems that the exhaust valve is pretty much toast. I am trying to find out if this is a common problem for this vintage of the XS or maybe just on the 500 of this era? Any help or insight would be greatly appreciated. David 2006 Yamaha FZ1 1998 Yamaha Vmax 2004 Honda CRF250X Total Control Instructor www.totalcontroltraining.net MSF Rider Coach MSF Dirt Bike Coach ATV Instructor