i have a 98 cbr 900 the fan is on and i put in a new thermostat and radiator cap just had it flushed out and it is still overheating and the other day at a light it just shut off on me after reaching 217 degrees. what could be wrong here bike was just fully tuned up and carbs cleaned out. please help i have no idea and its riding season i need to be out riding.

 

The fan doesn't normally turn on till 220*, Why do you think it is overheating? I have never seen a 900 stall being at 217* When it cooled down did it start again? More info would be helpful, Could be a fan relay or ??

 

Try replacing the coolant with "Engine Ice" or "Water Wetter"

Do you have a fan switch, that lets you turn the fan on manually? That might help too.

Possible, there might be a bubble or bubbles in your radiator that's not letting the coolant and water circulate freely.

 

i do have a switch for my fan and when i shut of the bike and the temp is any hotter than 210 the fluid comes out of the overflow hose on the reserve tank i used water wetter but that didnt do anything so if i do have bubbles in my radiator how do check for them and get them out?

 

Sorry I don't know...another place to get great advice is the "Help me Fix It" section of sportbikes.net

There are some actual bike mechanics/techs who post there. Try it there.

 

Our 900's turn the fan on via a relay and there is no manual on/off switch. Did a shop do the work or you? It sounds to me like there is air trapped in the engine and that is why it is overheating, Let me check the manual and see if there is an air bleed on the engine BRB, The manual does not specifically say there is an air bleed but there is a drain bolt on the water pump, You might try loosening it and see if air comes out. The manual states to bleed air as follows shift trans to neutral and start engine, Let idle for 2-3 minutes and then snap the throttle 3-4 times to bleed air out, Then stop engine and remove cap and fill as necessary
Hope that helps solve your problem, I have changed my coolant 4 times following these directions and never had a problem. If you are still having bubbles in the radiator while it is running I would be more inclined to say it has blown a head gasket, You can warm up the engine and shut it off and remove the spark plugs and see if it sprays water out of the cylinders when cranking as this is an easy way to check the head gasket, While the engine is running the compression will push air into the cooling system. When you turn the engine off the cooling system is still pressurized and will force coolant into the cylinders, Also look at your site glass ans see if the oil looks milky