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Discussion Starter #1
hello everybody . my bike is a 2007 cbr600rr and i use this bike for just about every thing you could imagine a sportbike doing. in most cases this is my daily driver. now, the problem. its currently leaking coolant ( distilled water with mocool additive) anytime the bike gets hot and i stop moving. so like a little at red lights and usually ton when i park it. recently i did a flush and i replaced the honda coolant that was in it with this water mix.

the first time i noticed it was at this go cart track that i go to. i didnt get it out of first the whole time and was riding it high in the rps pretty hard. it was also a hot day and i went from hard riding to stop and turning off. then i look down because it felt like somebody was pissing on my boot and my coolant is shooting everywhere!. somebody there ,who happened to be a bike mechanic, told me that in this scenario it was completely normal and i should just top off when i get home. he said sense the coolant isnt pumping the engine heat ( climbed to 240 after being stopped) is boiling the coolant off and the steam is causing the reservoir to spit out coolant. OK , so i finished my track day and went home. right when i got home i let the bike cool and topped it off. the bike has spit out like a half gallon , maybe even more than that it was a week ago and i dont remember too well.

well yesterday i get home from a small trip to missouri and i go check the coolant level to make sure it didnt need a top off before riding and when i pulled off the cap it sounded like a bottle of soda letting all the CO2 out when you first open it. once i hear the noise i hear coolant leaking from the reservoir. ****. i top it all off and carry on. so im riding it in traffic and it starts to get hot .. really hot . so hot this its spraying everywhere on me and im forced to constantly turn around to dodge red lights just so i can keep the temp down by moving. well i get home and im pissed as ****. i top it off and pay careful attention to burping it and everything. i even let it sit all night with the cap off for more bubbles to escape.

so that brings me to today. radiator and reservoir full i adventure off on the 5 minute ride to school . nothing happens. take it to Walmart to pick something up really quick and nothing happens. i ride it through traffic maybe 15 mins and the bike didnt even get up past 220. nothing happens, not even at long lights. pull into the driveway and cut it and hop off and see a nice little puddle forming. **** . now im here .

alright. so obviously im wondering what this might be and what i could do to stop this from happening...
my thoughts :
1 the motul mocool product sucks
2 ive read about the radiator cap causing problems, so maybe i need a new one.
3 maybe due to the warmer weather its not feasible for me to run water in my area( fort collins colorado)
4 i should just switch back to coolant
5 im doing something wrong.

thanks for reading the post, hopefully somebody out there knows whats going on here.. ohh yeah and one last thing. the hoses are NOT backwards. thats the first thing i checked and by filling the reservoir i dont mean full i just mean slightly over the bottom line. thankyou :)
 

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It sounds like you didn't burp all of the air out of the system. You've probably got air trapped and you need to go back and burp the system again.

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You did check your drain bolts to make sure they're not leaking right?

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Are you hearing the coolant fan turn on at 221°F? Your coolant fan or the relay may be bad if the fan is not running. I didn't see you mention that.

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And use Engine Ice. Once you get the air out...? I'm not familiar with the Motul coolant but you do need more than just pump lubricates. EI will even work down to -26°F for freeze protection.

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Discussion Starter #6
And use Engine Ice. Once you get the air out...? I'm not familiar with the Motul coolant but you do need more than just pump lubricates. EI will even work down to -26°F for freeze protection.

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honestly if i switch at this point to anything it will be back to coolant ! unless of course engine ice is cool to leave in the bike all winter...
 

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Discussion Starter #7
Are you hearing the coolant fan turn on at 221°F? Your coolant fan or the relay may be bad if the fan is not running. I didn't see you mention that.

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the fan seems to be working fine. it just runs alot more sence ive done this whole coolant thing lol
 

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Discussion Starter #9
You did check your drain bolts to make sure they're not leaking right?

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if the drain bolt is leaking, theres no way its this much . i will check again though to be certain. like when i say theres a puddle i mean immediatly after the bike is turned off i set it on the kick stand hop off and within that 5 or 6 seconds theres a fairly big puddle under the bike.
 

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Just make sure the bike is level when you fill and burp the system again. You shouldn't try this on the side stand.

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Discussion Starter #11
It sounds like you didn't burp all of the air out of the system. You've probably got air trapped and you need to go back and burp the system again.

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to my understanding you fill up the radiator, wait till it stops bubbling, then turn it on and rev it up till the bubbles stop. then i like to leave it sit for a little just to make sure the bubbles have completely escaped. does this sound right? if so how many times/ how much time should i spend revving it?
 

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If you're allowing it to cool with the cap off that's probably why you still have air in the system.

Make sure the coolant reservoir is full and the bike is level. Warm the bike for a couple of minutes with the radiator cap off, all the while topping off the radiator.

The trick is to "rap" rev the throttle just enough to force out any trapped air without blowing your coolant out.

Once you think you have all the air out and the radiator topped off go ahead and turn the bike off. Replace the radiator cap and wipe the bike down.

Let it cool off completely and then check your reservoir level again. Don't open the radiator cap. Fill from the reservoir.

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If this method doesn't work you probably have a hole in the radiator or a hose is leaking somewhere. You'll need to pressure test the system to find the leak.

I'm can't be sure if the puddles are from it blowing coolant or leaking coolant.

Did you remove the oil filter with a screwdriver driver by any chance?

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jesus christ what a mess of a thread.


coolant has a less cooling ability than water does. switching to coolant won't increase your cooling capacity.



if you had a leak in the system it would leak all the time. you don't have a leak in the system.



if you had air in the system, you wouldn't have water spewing everywhere, the system would be low, eventually the air would work its way into the reservoir and during cooling cycles the system will pull fluid to replace it. if there's too much air and the system is never able to fully pressurize, the cap will never open so you'll just overheat without any fluid spilling from the reservoir overflow.




you have what's almost certainly a bad rad cap, or some junk in the rad cap seal that's allowing the system to push fluid into the reservoir.




your cooling system is pressurized, this increases the boiling point of the fluid within it. the rad cap has a spring in it that allows fluid to migrate into the reservoir when the system tries to over pressure. so when the bike is hot, it's totally normal for the level in the reservoir to increase.


as the system cools off, there is a check valve in the cap that allows fluid in the reservoir to migrate back into the radiator.




if you have a bad cap spring, or a bad check in the cap, or a piece of crud in the cap seal, the system is never able to pressurize. when this happens, the thermal expansion of the fluid due to temperature forces it easily into the reservoir, overflowing it.





to put it briefly, check your rad cap.
 

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I would have to agree with Wibbly, especially if the coolant is indeed leaking from the reservoir overflow hose.

Be careful, if your cap is not holding pressure as it should, your coolant will boil and you will overheat all while your temp gauge reads you are fine. Once the coolant boils, your temp sensor is unable to work properly, and the actual temperature of the steamy coolant mix is much higher than indicated. Replace your cap and try again.
 

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Discussion Starter #17
ok , i need a new cap from what it sounds like!.

i am 100% sure its comming from the reservoir overflow tube.

so just to be clear, when i fill the radiator and burp it i want to put the cap on while its still warm?

and if i read your responses correctly im going to want to keep an eye on my reservoir level because if i dont quite burp it all the way it will pull coolant from the reservoir?
 

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I just recently had some spillage out of the rad cap. Turned out to be the little tabs on the cap that thread onto the radiator neck. Bent them back in and problem solved itself as I waited for a new one to come in the mail.

Check those tabs.

Edit: As for burping, there are loads of how-tos on this forum in the maintenance section. I can't pull the steps out of memory so take a look.
 

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Discussion Starter #19
I just recently had some spillage out of the rad cap. Turned out to be the little tabs on the cap that thread onto the radiator neck. Bent them back in and problem solved itself as I waited for a new one to come in the mail.

Check those tabs.

Edit: As for burping, there are loads of how-tos on this forum in the maintenance section. I can't pull the steps out of memory so take a look.
i actually just pulled mine out and cleaned it up really good. hopefully that helps. but if not i have one in the mail! and thankyou i will search around a bit
 

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so just to be clear, when i fill the radiator and burp it i want to put the cap on while its still warm?

and if i read your responses correctly im going to want to keep an eye on my reservoir level because if i dont quite burp it all the way it will pull coolant from the reservoir?
Yep. Once the system cools off it'll create a vacuum and pull coolant from the reservoir to replace any air.

Make sure you clean up everything before you walk away. That way you can see if anything leaked while you were gone.



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