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chrispa

YZ450F left to idle coolant bubbling

17 posts in this topic

hey guys

I was installing a brake light in my YZ450F 2008 and after about 10 mins the coolant started bubbling so I switched it off..

I'm going to replace the coolant...

I'm really worried that I've done some damage to the engine?

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hahahaha i done the EXACT same thing dw u didnt do damage its just that there was no air flowing and it overheated so it spilled out as long as u turned it off u will be fine thats my oppinion

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I'm surprised it took 10 minutes! They need air moving over the radiators.

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While it was running,how did you know it was "bubbling"? Were u running it with the radiator cap off?

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it wouldnt of been bubbling for longer than 3-5 mins... the cap was on..

was there green smoke/liquid comming out from a hose under the bike? yes or no

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no smoke, just green coolant out of the overflow on the radiator onto the floor, no glowing exhaust etc. i since drained the coolant and replaced it, took it out for a ride, started first kick, responded as it always has.. i dont think ive done any damage..

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also do I have to bleed the cooling system to remove any air pockets caused by the boil over? I'm unsure on how to do this, is there a bleed valve somewhere on the YZ450F?

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no smoke, just green coolant out of the overflow on the radiator onto the floor, no glowing exhaust etc. I since drained the coolant and replaced it, took it out for a ride, started first kick, responded as it always has.. I dont think ive done any damage..

you have not done any damage at all. Relax a little. End of thread

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Yup, the YZF's should not be allowed to idle for more than 45 seconds or so. They will blow coolant out the cap quickly. Start your YZ give it a 30 second warm up, and get the bike moving. Ride the bike easy for another 5 min or so, then let er' rip ! :ride:

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Yup, the YZF's should not be allowed to idle for more than 45 seconds or so. They will blow coolant out the cap quickly. Start your YZ give it a 30 second warm up, and get the bike moving. Ride the bike easy for another 5 min or so, then let er' rip ! :ride:

really? 30 seconds? thats it? y so little time?

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really? 30 seconds? thats it? y so little time?

You can idle longer than that, the manual says to let it idle for 3 minutes before doing an oil change.

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The manual contains a lot of little errors like that that are carried over from one manual to another without any thought. A glaring and serious example is the recommendation to lap valves.

If you face the bike into a 10 mph wind, you may get away with idling for 3 minutes. Otherwise, I'd bet against it.

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The manual contains a lot of little errors like that that are carried over from one manual to another without any thought. A glaring and serious example is the recommendation to lap valves.

If you face the bike into a 10 mph wind, you may get away with idling for 3 minutes. Otherwise, I'd bet against it.

Well I've only had the bike a little over a month and have only done 1 oil change but I let it warm up for about 3 or 4 minutes and it didn't overheat or even make a gurgle. Maybe it's the Amsoil coolant or maybe I'm just lucky.:ride:

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