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Hi Nortey, and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat. See dealer.
4. Coolant pump or fans inoperative. See dealer.
5. Vent hose crimped.
6. Air in coolant.
For more information about your issue, please visit the websites below. Good luck and have a nice day. Honda Motorcycle Service Repair Workshop Manuals
firstly, is your fan coming on? Should kick'in between 103-110 max.
If no, then check you have no air trapped in the water system which will stop circulation and make your water boil. If the system is bled properly and still no fan coming in then check the fan switch.
If your fan is coming on and still overheating after a while then you could have a water pump problem. Worse case you have a blown gasket which can usually be identified by checking the oil for cream and will also produce continuous smoke from exhaust. If theres cream looking oil rather then brown/gold then poss head gasket or could still be water pump seals....
make sure that the thermostat is working and opening to let the flow of water in the engine, if it's ok you should start it and let it warm up and see if the cooling fan starts when temperature reaches close to 98 degrees, is it doesn't and the coolant boils then you have to change the temperature sensor as it is faulty.
Possibly has air in the coolant system causing the coolant to boil. You can flush the whole thing if your coolant is in need, but mainly open the radiator cap and shake all hoses to release air while adding more coolant. Also may be the radiator cap spring (maybe). I am not sure about why it will not start up... maybe a sensor will not allow it.
* I am not certified in anyway and have minimal knowledge, my 05 r6 had air in the coolant and would boil out of the overflow. Make sure you use distilled water to avoid corrosion.
It sounds as if you have an air lock in the coolant line. Bleed the coolant system and check that the thermostat works by doing a resistance check while the thermostat is in a jug, into which you pour boiling water. It should go "Short" when at boiling. Coolant in most bikes is usually kept at around 80-85 Deg C. I hope this helps
when you say boils over do you mean dumping out the over flow pipe ? have you tried new radiator cap
sorry mate it seems like you checked everything but I have seen plenty of MX bikes come in from hard race and dump half their coolant on the floor through the over flow pipe as soon as they turn engine off
its nearly always the radiator cap (pressure release) is to weak when this happens
thought it worth a mention but no doubt you checked already?
That sounds about correct, with the pressurized system this raises the boiling point to about 105 or more, and the fan is just to assist to stop it boiling , so if the fan brings the temp down to 90 and then stops, this would seem all is well. If the bike is boiling before the fan starts, there could be trouble brewing, new cap, coolant and thermostat are a good start
Petrol engines like to run at or just below boiling point. The radiator is pressurised and that stops the coolant from boiling. I would not be happy if it got any hotter as I would worry that the coolant may expand too much and leak. Try using less power on hot days when in traffic and keep moving the air through the radiator. Hope this helps.