My 1999 CBR600F4 loses power and shuts down when it gets hot. Any ideas why?

 

check your rectifier, i had the same problem on mine.

 

You may also check to make sure the radiator fan is turning -- my bro's 99 f4 had that problem.... just needed to replace a fuse.

 

Mine is doing the same thing (2000 F4) and I replaced the fuse and still no change. It might be a bad fan. I'm planning on changing mine this weekend and we'll see.

 

does the fan come on when its hot? check that before you replace the fan.

 

NO, the fan doesn't come on. The bike gets up to running temp and then shuts down.

 

Does it bog down or just instantly shuts off? And how hot do you consider normal running temp?

 

It starts to bog down then dies. Normal running temp on my bike is usually close to halfway between hot and cold or a little below halfway. A little closer to cold but almost directly halfway is when it tends to shut down. I don't lose power (the lights, dash lights stay on) but it acts like it's not getting fuel. When it was crashed I had to change the tank and dash (whole front clip) along with fairings, tail section, all the plastics and painted areas except the front fender were changed. It won't start at all until it cools down and then will run great until it gets hot and it repeats the pattern. I have changed the fan fuse, it still happens. I have changed the rectifier, although I bought a used one on ebay the guy said was new, installed, taken out and in perfect working order. I have changed the stator bought new. I have changed the battery (new). Thanks,

 

Does it overheat even while moving?

 

It's not that is overheating, although it did once (all the way to the red mark) and that's when the problem started. It just won't keep running. It's only 5 min into the ride or I only get about a mile away (up to the midpoint or a little below on the temp gauge) and it starts bogging down like a sensor is telling it to shut off as to not damage the motor. I think from everything I've read on this site (30 plus things) that it is electrical in nature. Many others have said theirs did a similar thing and it was the rectifier. A couple of other people suggested a head light switch was malfunctioning and another guy said his problem was with the ignition module. I've already put $2500 into repairs after I crashed it and I'm afraid that if I keep going at this rate I'll spend twice what the bike is worth. The bike only has 5000 miles on it so it is pretty new for a 2000 f4. One guy said he thought because of the blown fuse with the fan that it sounded like the best place to start. I originally took it to the dealer and they said it was the stator, rectifier and battery. I changed those and still nothing. I'm super frustrated at this point and I just want my bike back. I crashed it in '04 and I have only ridden it about 100 mile since. Thanks