Join Date: Sep 2004
Location: Albuquerque, New Mexico, USA
How do your plugs look? A very lean mixture will cause overheating. Rich mixture the opposite. A lean mixture will cause the plugs to look a very pale color or even white. A rich mixture will cause them to look blackand sooty. Proper color is a medium brown to tan color.
Is your bike running okay other than the overheating? If so it's probably not the mixture.
And the cooling system on a GL1000 should be more than adequate to compensate.
Check to be sure your cooling system is not plugged. A broken thermostat will cause overheating. Also make sure there is enough coolant in the radiator by taking the right shelter cover off. The radiator cap is toward the front and the coolant reservoir will sometimeshave a "bathtub ring" that fools people into thinking its full. Open the top and look down inside.
If the coolant is low and you don't have any external leakage your head gasket could be blown. Check for steam or very wet-feeling exhaust (after its warmed up). Also check for coolant in the oil, or milky looking oil.
Aside from leaking around the shaft seal I haven't heard of water pumps failing. The radiator could be plugged internally.
Does your engine overheat while inderway or just when standing? Check for proper operation of the electric fan. There could be a birds nest blocking the fan, or a fault in the wiring, switch, or fan itself.
\'77 GL1000 (sold)
\'08 Suzuki V-Strom DL650
\'99 Ducati 900ss
\'97 Honda XR650L