Question about 2007 Suzuki GSF 1250 Bandit S

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Bike overheated whilst at idle after a couple of minutes and steam appeared and water ran from the radiator. Why did this happen ?

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First impression would be the cooling fan didn't kick in to pull air across the rad. A motorcycle liquid cooled or not isn't meant to sit at an idle more then the length of a traffic light. It relies on the forward movement of the bike to pass fresh air across the rad. If you were running this in a garage or enclosed workshop then you haven't got the flow of air. In motorcycle shops I see 20 inch fans used to circulate air across the rad and or cylinders as the mechanic is working on the engine while it's running.

It's not a car and if youn have had that engine that hot that the rad is boiling over then you have some engine damage might not be evident right now but before long there will be heat related problems crop up. Possible wiring and cylinder head gasket, coolant in the oil and if that isn't caught quickly it'll destroy the bearings in the bottom end of the engine.

Sorry to be a barer of bad news but it's better to know this then figure you got away from it without problems. One other thing is a simple thermostat in the cooling system may have stuck closed and caused the same problem. That's if there was sufficient air flow across the rad.

Best of luck hope you have been sitting on a horse shoe for luck

Posted on Mar 27, 2011


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The bike is obviously running way too lean if you were riding it during the 30 minutes you mentioned in your question. If it was sitting for 30 minutes, without air circulating around the engine, your exhaust would become extremely hot possibly melting the Air Filter Case. Check to make sure you air filter is clean and your carb(s) is/are set correctly. You should have an Idle Speed adjustment knob also - check your user manual to see if there is an idle speed RPM setting and set yours to it.

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If you find this post helpful, please vote. Thank You.



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