Engine overheating on your Suzuki GSX1100E can be caused by these things: Engine oil level too low. Check the crankcase oil level.
Incorrect engine oil viscosity. Be sure to use the correct oil for the temperatures in your area.
Fuel-air mixture too lean. Caused by clogged carburetor jets from long term storage. Modifications to the air filter or air cleaner box will require carb re-jetting. Air leaks between the carbs and engine - check for lose clamps and cracked intake manifolds.
Incorrect ignition timing. Unlikely, but easy to check.
Damaged or extremely dirty oil cooler. Make sure there's nothing blocking air flow through the cooler.
Riding for extended periods at slow speeds - or idling the engine too long will cause insufficient air flow and overheating.
Finally, is it really overheating? Normal engine operating temperatures are pleanty hot enough to burn the skin if you touch most any part of the engine. Check the actual oil temperature. Anything above around 240F is cause for checking all of the items listed above.
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