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Old 05-27-2013, 01:17 AM   #1
sullivan
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Bike running hot

Bikes been running a little hot, first time seeing the temp light come on in traffic last week and a few other times this past week. Oil level is fine, less then 3000 miles on it. Radiator overflow tank is full. I wrecked the bike last year and put a new radiator on after and made sure to mix the proper amount of distilled water to the Kawasaki fluid. its ran fine with no issues up until now, and that wreck was over a year ago.

its a 2008 kawasaki ninja 650.

thinking about changing the oil,plugs,new air filter
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Old 05-27-2013, 02:24 AM   #2
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Thermostat might be sticking. Trying pulling it and boiling to see if it does stick.
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Old 05-27-2013, 05:59 AM   #3
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did you bleed the air out of your radiator when you changed it? you could have air still trapped in the system....

when you change the radiator fluid or add fluids to the system be sure to run the bike for a few minutes with the radiator cap off the bike and give it a couple of blips on the throttle so the air trapped in the system will bleed off. you'll see air bubbles rise to the top and out of the radiator cap when doing this. keep running the bike until you don't see any more bubbles.
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Old 05-27-2013, 08:28 AM   #4
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I agree with burping it.
Also, when you changed the radiator I'm assuming you swapped the fan from the old one?
Make sure the fan is spinning freely and is moving air. Last, if for whatever reason you cut the connector make sure it's wired correctly and not backwards causing the fan to rotate incorrectly.
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Old 05-27-2013, 09:10 AM   #5
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How does your coolant look? Might as well change out the coolant.
Thermostat may be sticking.
Radiator cap not holding proper pressure.
Air in the system.
Fan not working/spinning freely.
Radiator fins bent or clogged.

Worse case scenarios: water pump impeller blade broke off and is stopping coolant flow.
Bad head gasket.
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Old 05-27-2013, 09:26 AM   #6
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My Streetfighter has been having the same issue. I called the dealership to see how much a new thermostat cost...



$216!!!!!

They should gold plate them.

There are 2 reasons why it costs so much.

1) Compared to cars, the people that make them don't sell very many bike thermostats. They still have to run the factory, make all the parts and pay people to put them together.

2) It's Ducati
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Old 05-27-2013, 09:56 AM   #7
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Get a thermobob
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Old 05-27-2013, 03:06 PM   #8
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Quote:
Originally Posted by Mr.337 View Post
did you bleed the air out of your radiator when you changed it? you could have air still trapped in the system....

when you change the radiator fluid or add fluids to the system be sure to run the bike for a few minutes with the radiator cap off the bike and give it a couple of blips on the throttle so the air trapped in the system will bleed off. you'll see air bubbles rise to the top and out of the radiator cap when doing this. keep running the bike until you don't see any more bubbles.
Well it kinda burped on its own, I didn't have the hose on one side clamped all the way and it burped from there haha. but I guess I should burp it some more.

Quote:
Originally Posted by Patrick View Post
I agree with burping it.
Also, when you changed the radiator I'm assuming you swapped the fan from the old one?
Make sure the fan is spinning freely and is moving air. Last, if for whatever reason you cut the connector make sure it's wired correctly and not backwards causing the fan to rotate incorrectly.
If I burp it more do I just take the cap off the radiator, or can I open the reservoir tank.

The fan is the old fan and it is spinning freely and moving air. Its wired up though the factory wiring.

Quote:
Originally Posted by cuong-nutz View Post
How does your coolant look? Might as well change out the coolant.
Thermostat may be sticking.
Radiator cap not holding proper pressure.
Air in the system.
Fan not working/spinning freely.
Radiator fins bent or clogged.

Worse case scenarios: water pump impeller blade broke off and is stopping coolant flow.
Bad head gasket.
Coolant in the overflow tank looks nice and green like it should. I will try bleeding it some more, but I have been riding it for over a year like I said with no issues.

Quote:
Originally Posted by bumblebee View Post
My Streetfighter has been having the same issue. I called the dealership to see how much a new thermostat cost...



$216!!!!!

They should gold plate them.

There are 2 reasons why it costs so much.

1) Compared to cars, the people that make them don't sell very many bike thermostats. They still have to run the factory, make all the parts and pay people to put them together.

2) It's Ducati
My kawi wouldn't cost that much hopefully lol

Quote:
Originally Posted by cuong-nutz View Post
Get a thermobob
say what?
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Old 05-28-2013, 04:37 PM   #9
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Sounds to me like the thermostat is stuck partly open. One that's stuck close will make the bike overheat within a few min of starting the bike do to no coolant circulation. One stuck partly open will result in it taking a little longer to get to operating temp. It also may run pretty cool while moving, but usually overheat at stop lights, or long stops.

My advice it's to gut the thermostat. Cut the back side off so you can remove the spring and plunger. Best part about it is its free, and your bike will run cooler since there's very little restriction in your cooling system.

I do this on all the turbo hayabusas I build. The downfall is you have to wait an extra min or two for the bike to come up to temp, which isn't a big deal.
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Old 08-30-2013, 04:37 PM   #10
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ok so my bikes running hot again and still haven't figured it out yet...

is there anything bad about gutting my thermostat besides the extra couple minutes of warm up time?
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Old 08-31-2013, 03:29 AM   #11
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Quote:
Originally Posted by sullivan View Post
ok so my bikes running hot again and still haven't figured it out yet...

is there anything bad about gutting my thermostat besides the extra couple minutes of warm up time?
Nope. The only time you'll really notice warming up slow is during the winter. That's when you want to give it a few min. Otherwise your good.
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Old 08-31-2013, 07:44 AM   #12
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Modding the thermostat is a pretty common fix. Like stated above especially on turbo bikes
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Old 08-31-2013, 08:04 AM   #13
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I put engine ice in both of my bikes, and temperatures dropped. What bike are you having problems with?
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Old 08-31-2013, 08:14 AM   #14
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Old 08-31-2013, 09:13 AM   #15
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I put in engine ice about 2 maybe 3 years ago. Is it time to do it again? The color of it in reservoir is still blue.
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Old 08-31-2013, 09:29 AM   #16
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Quote:
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I put in engine ice about 2 maybe 3 years ago. Is it time to do it again? The color of it in reservoir is still blue.
One of my manuals says to change the coolant every 2 years, and to replace cooling hoses every 4 years.
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Old 08-31-2013, 10:03 AM   #17
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I've seen Engine Ice cause issues, especially if mixed improperly or if the bike gets too hot.
It breaks down and creates a "soapy" type of residue, inhibiting heat transfer.
As far as removing the thermostat, while you can do it with minimal negative effects, on a stock street bike it's not necessary, nor do I recommend it.
As far as how often to change coolant? On an aluminum based engine I recommend every 2-3 years depending on how many miles and what kind of use it see.
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Old 08-31-2013, 10:11 AM   #18
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Quote:
Originally Posted by murderedout07 View Post
Sounds to me like the thermostat is stuck partly open. One that's stuck close will make the bike overheat within a few min of starting the bike do to no coolant circulation. One stuck partly open will result in it taking a little longer to get to operating temp. It also may run pretty cool while moving, but usually overheat at stop lights, or long stops.

My advice it's to gut the thermostat. Cut the back side off so you can remove the spring and plunger. Best part about it is its free, and your bike will run cooler since there's very little restriction in your cooling system.

I do this on all the turbo hayabusas I build. The downfall is you have to wait an extra min or two for the bike to come up to temp, which isn't a big deal.
You can't do this if the thermostat has the bypass shut off valve on the back of the thermostat and if you ride in cool weather the motor will never come up to temp. Your view is probably this, All the engineers are idiots and I know better then them. So your fix might work for a turbo hayabusa, it is not the fix for a stock ninja 650.
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Old 08-31-2013, 09:15 PM   #19
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I don't appreciate words in my mouth, and I don't think their dumb 's.

However Kawasaki usually goes overkill on their radiators. Not a bad thing. As I suggested earlier on the thermostat may be suck partly open thermostat. Allowing the engine to get up to temp in a seemingly normal amount of time, and still flows enough to keep the engine cool while moving, but sitting in traffic is where it shines, and over heats do to insignificant flow.

A faulty radiator cap, or old coolant will also make it run warm, but my money is on the partially. I've never personally had to gut a thermostat on a small cc bike, but gutting it on the busa's is almost a must for turbo bike customers of mine, even with 2 fans. It has its place.

You must share that view. Tell me more about how stock all of your bikes are in regards to exhausts, fuel tuners, brake pads, brake rotors, and chains. If you have anything else besides oem stuff, appearetly you must know better then the engineers too.

And Patrick is right, engine ice causes a waxy build up that clogs radiators, and passageways. I guess that's why engineers don't put that in the bikes from the factory either.
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Old 08-31-2013, 11:24 PM   #20
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Ok so I tore the entire bike apart to diagnose this thing, and mean while I pulled the tank the air box and stuff since its due for spark plugs.

The water pump impeller is fine and not damaged at all.

Well, I just boiled some water, put the thermostat in the water and the THING NEVER OPENED!!!

So I plan to order a new one. People on another forum were totally against me gutting the thermostat I have now... They said the bike would never get up to operating temps if I do this.

Patrick is this something you might have instock? Im going to see if my local kawi/honda dealer ship has this thermostat because I really hate to wait for this to be shipped.

My bike has an arrow exhaust, pair valve plugged, and a throttle body mod, all of which makes my bike run lean since I have no tuner on it. But this CANNOT be the cause of my over heating.

I'm relieved to find out that my issue was the thermostat.
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Last edited by sullivan; 08-31-2013 at 11:28 PM.
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