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2006 gsxr 750 cooling issues

5K views 18 replies 7 participants last post by  Shadow91 
#1 ·
Hey guys I have a few questions and sorry if I'm not posting on the right page I tired looking for the right place to post, anyways I recently purchased an 06 750 for dirt cheap the reason I got it for cheap was because it was overheating and the previous owner did not want to deal with it. So here's the issue;

The bike starts right up and runs good only if I'm on the highway, once I hit the streets the temp rises quick the highest it went on me was at 230 I then got nervous and decided to let it cool so when I shut it off coolant began to spit out of the overflow hose and I'm not talking about dripping I mean a decent stream came out. I added coolant and it didn't take much kinda seemed like it was full So I did some research and decided to flush the cooling system and replace the thermostat. When I flushed the coolant not much came out which baffled me because when I would top it off it wouldnt take much like if it was full any thoughts?

Second question; this may sound dumb but do 2006 gsxr 750 have thermostats? I removed the gas tank and removed the thermostat housing and there was not thermostat, didn't think much of it just figured the previous owner removed it and ran it like that which is why I thought it was overheating anyway I began to look online and I couldn't find any thermostats for a 2006 gsxr 750 I'm extremely confused if anyone could help me it would be much appreciated, thanks in advance
 
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#2 ·
Have you checked to see if the fan is kicking on? It should kick on around 220 F unless the previous owner had the ecu reflashed to make it turn on even before that.

You say you flushed the coolant and nothing really came out, how much is "not much"? If you had run it hot and it had overflown that could account for the loss in the system if you hadn't topped it off since.

Yes, they do have thermostats. You should pick up a service manual somewhere as that info as well as how to replace it is in the manual.
 
#3 ·
I mean coolant did come but maybe only about 2 to 3 quarts and before flushing it id top it off but was acting like if it was full and yeah the fans turn on. Would you happen to know if the thermostat goes right underneath the housing or would I have to remove all 4 screws and take the whole set up off? Thanks
 
#5 ·
A quick search using the search bar at the top of the screen would answer most things. People have walk-throughs on it and all. Also if that doesn't do it (which it does), a quick google search or youtube search will give you results as well.

The service manual will get you fast results also so I would say be sure to pick one up soon.


Skip to 3:50 in the video.

https://www.youtube.com/watch?v=fby5mF_5MoQ
 
#6 ·
Welcome.

Just because there is coolant in the reservoir, does not mean the engine and radiator is full.

You fill bleed and burp the system first at the radiator cap and then adjust the level in the reservoir.

Yes, there is a thermostat, and you need to install one if it's missing. Possibly someone's previous mistaken attempt to solve the cooling problem.

Do you have any history on the bike? Has the water pump been changed or messed with?
 
#8 ·
#21. I don't know why it was hard to find.
 

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#9 ·
Alright guys I have a disappointing update; so I flushed the cooling system and changed the oil while I was at it. I found and bought a thermostat and went ahead and installed it (assuming) I did it right. Connected everything and began pouring the fluids; 3 quarts of 100% synthetic oil and engine ice for the coolant I filled the radiator to the top of the cap and left the reservoir empty until I was done then I was going to fill it half way. So when I finished adding the coolant I left the cap off and began to gently rock the bike to the left and to the right to bleed the air out I did notice bubles coming out I then proceeded to turn the bike on and let it warm up but the bike reaches 220 too fast and the coolant began to fill the reservoir tank. Am I doing or did I do something wrong? Plz help
 
#10 ·
Idling, on a reasonably warm day, the bike should get to 221 F degrees, the fan should kick on and the temperature drop down to 212 where the fan will shut off. Repeat.

Is your bike doing this or does it just continue to climb?

I asked you previously if the water pump has been screwed with.

There have been two recent cases of people breaking off the water pump drive shaft when installing the pump.
 
#11 ·
It was around 95 degrees when I warmed it up the temp reaches 220 and the fans kicked on I then shut the bike off because I didn't want to do any damage if in case i didn't do something wrong. The pump was replaced a while ago. Before I flushed the cooling system and changed the oil which at the time it didn't have a thermostat it didn't seem to warm up that fast and now that I flushed the cooling system and replaced the oil and added the thermostat the temp rose pretty fast too fast as compared to before
 
#13 ·
The bike is not going to blow up if it gets to 240-250 F.

Run it long enough for the fan to come on and see what happens.

If the fan comes on and the temp drops then you don't have a problem.

If it continues to climb past 230 then you probably do have a problem.
 
#17 ·
Also be sure to crack open the bleed screw on the water pump after you fill the system.

It's the one 10mm bolt head on the water pump with a crush washer.

Fill the radiator, doing the rock side to side thing helps, or I just kinda squeeze the hoses gently... then crack open the bleed screw until a small stream of water comes out and you know there's no air in the water pump..

The thermostat actually creates back pressure in the cooling system, helping prevent cavitation in the water pump. I've pulled thermostats before for special cases, but it helps to replace the thermostat with a plate with a hole in it to act as a restrictor. We could then vary the running temps a bit by changing the size of the hole. For a normal street/track/race bike, I wouldn't bother and just stick with the thermostat.
 
#18 ·
Update I opened up the bleed screw from the water pump and air did come out I gently squeezed the hoses and rocked the bike and as soon as I started the bike it stopped leaking from the overflow hose in other words the coolant didn't fill up the reservoir tank like it used to and I let it warm up for about 10 mins and temp didn't even reach 190. Thanks for all the help guys now I can ride it!!!! :))))
 
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