I recently bought a 2000 cbr 600 f4 and it overheats, and when it gets hot the engine sputters and starts to stall out. i have changed the water pump, got a new thermostat, then took the thermostat out completely, i got a new radiator cap, i flushed the cooling system, it seems to be holding pressure but all the coolent evaporates and shoots out of the overflow... if the bike is cold and i rev the engine with the radiator cap off, the coolent comes shooting out, which makes me think its a headgasket issue but my oil is pretty clean with no signs of milky coolent like ive read there should be if its a blown headgasket. so i need some help figuring out what could be wrong thats causing this nonsense.... Please HELP ME!!!

 

a head gasket can also leak, and not be fully blown it would be hard to detect but it would make you overheat, im not sure what the specs are but google what the compression is supposed to be and compression check the motor that will tell you alot of what your engine is doing on the inside..

 

a blown head gasket doesn't always mix coolant with oil. it just depends on where the blow happened. what is happening, is part of the gasket is blown between the coolant passage and the combustion chamber, leaking into the cylinder and blowing the exhaust gasses into the cooling system and pushing it out the radiator.

 

 

His solution was to start his own thread with as much information as possible of the symptoms that the bike was having. He then got some ideas and must have found the problem because that was 7 1/2 years ago.

 

Ha!

(you are indeed psychic)

 

is the problem happening when your headlight is on? Try turning it off and see if the problem persists. I had the same problem on my 99 F4, there was a short circuit on the main headlight wiring, which, when the fan kicked on and the headlight was on, it would drop the voltage supplied to the coils just enough to make the bike sputter and die. So, in short: There is a short circuit somewhere and when the fan kicks on, it robs the voltage needed for the coils to ensure proper spark. That's why it only happens when the bike is hot. Solution: Get a multimeter and check each and every wire on the bike to find the problem, mine was on the headlight wiring.

THIS IS A VERY COMMON PROBLEM

and to the best of my knowledge this is the only concret answer on the internet. Because people after they fix the issues, don't bother to write about them on the forum.

Cheers!