nelligan521 posted a topic in 250-530 EXC-F/XCF-W/XCR-WI am having overheating issues with my bike. I have an athena big bore kit on it that was installed prior to purchasing the bike. Radiator cap is 1.6psi I am running engine ice in it. Seems to over heat about a hour into riding. I do have radiator guards on with no punctures or leaks to the radiator. I am thinking either jetting, needs a new and bigger water pump, needs a radiator fan, or the head gasket may need changed out because so restriction from the gasket. These are the outcomes i could think of any help would be greatly recieved.