SABUSABOY
Registered
I have searched for the same problem but nothing can come close to whats going on. The bike overheated but not to the point of damaging the head a while back but went in for repairs to gearbox to be undercut and had head gasket replaced at the same time to be on the safe side. When bike gets driven a while and then riden hard for a while it pushes water into the expansion bottle, only at 1/4 of an inch to half an inch against bottle marker. But on cooling the water does not get pulled back into radiator. Could the head gasket be blown or is it just an air lock and need to be bleed? Sometimes when opening the radiator cap it makes a air rushing sound like when opening a soda can. Please help, at wits end and dont feel like sending bike back to bike shop which is over 750 miles away. Any ideas welcome.