David Thompson
XS400 New Member
Newbie here. I have an original 1982 Yamaha XS400 Maxim that my dad bought brand new. I just had the head gasket replaced as it was shooting hot oil out the left cylinder. After I got the bike back, it is doing something it never did before. When I stop at an intersection, the bike just starts revving until I shut the engine off. I am not moving the throttle at all and the choke is off. It just starts at idle speeds and then increasing revving faster and faster and faster all by itself. I don't know what the RPM's are because my tach is not working.
Any ideas what would cause this?
Any ideas what would cause this?