my 99 suzuki gsxr750 motor seems to be running very hot. The temp gauge gets very high like 240 high when im sitting and it climbs fast while im driving it goes down but never under 200 what could cause this prob?

 

fan not turning on?? bad radiator fluid? hole in the rad.? not enough fluid? rad cap bad?

 

the fan turns on. fluid is full and new stuff. no holes in radiator and havent checked the cap. Do i just take if off not really sure how to check it. I was thinking maybe thermostat?

 

its possible.. but when it opened to drop it down to 200 it would drop it down to normal you would think..

 

dude if his rad cap was bad he would know it....I believe your thermostat is stuck (if your bike has one), thats the most logical thing....

 

worn out water pump...

 

could be detonation also

 

on bikes with thermos can you just remove them. i know i have seen people do it on car's would this be bad for bikes?

 

u can remove em, can it be bad for bikes? do you let your bike properly warm up as of now? i sure as hell dont lol.. if u live where it gets really cold i wouldn't remove the thermostat

 

Just replace the termostat it's cheap and will most likely fix the problem.If you choose to remove it the bike will run cooler and will have a bit less power since it's made to run between 180-190.It average less mpg too.

 

dude, i live in arizona, my bikes at 180 degrees in direct sunlight , i wasn't asking any questions, i was answering dudes above me.

 

its my stunt bike i only ride it in lots in first and on the street everyonce in a blue moon. other than that it sits in my ac/heated basement. no i don't let it warm up. and it gets cold here but hardly ever dips below 32 during the day maybe at night tho i dunno

 

then pull the thermostat out n see what happens.

 

if it goes bad i will!!

 

im going to burp the radiator again, maybe i got an air bubble in there and then if that doesnt work do the thermostat. I was riding the other day and that bitch got crazy hot and had to shut her down I will keep you guys in the loop thanks for the replies so far

 

Just do the thermostat bypass mod... wire in a switch parallel to the thermostat. If the bike doesn't get hot with the switch on, then you have a bad thermostat. If it still gets hot, it was still worthwhile doing the mod, and when you track down the problem you still have yourself a switch to turn your fan on whenever you want.

 

ended up being some air bubbles in the radiator. Thanks for the tips

 

Do what???? air in the radiator, lol......a radiator will purge itself, im way confused. but whatever................

 

you mean the tempeture sending unit mod ,the thermostat is what regulates coolant flow by opening up when the temp gets hot and slowing the coolant flow when the bike is cold so it can warm up quicker

 

yep. bad water pump is all it can be if you got a good thermostat, radiator, and coolant