zx12r coolant boil-over - but temp is normal - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 3 (permalink) Old 07-11-2005, 09:40 PM Thread Starter
Join Date: Jul 2005
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zx12r coolant boil-over - but temp is normal

Hi all- I have a 2004 zx12r with only 1000 miles on it- I unfortunately dropped it lightly on the right side after getting in a corner too hot (It'sdefinitely a little heavier than my 87 gsxr750 used to be!!) Overran the road and ended up in dirt- soft and gentle- Nothing broken- only minor scratches. However- the bike now boils over coolant from the overflow tube- even thought the temp gauge is always within normal spec. I have filled the overflow bottle back up, only to have it boil out again as soon as the bike is warmed up. The Temp guage always reads 2/3 - 3/4 (range before red zone) the same as it has always read- prior to the lay-down. But the motor seems hot for sure-

Could I have a stuck thermostat, or a blocked one-way valve somewhere in the plumbing? No other issues at all- just recurring boiling of the coolant in the resevoir- and subsequent overflow out the overflow tube- Or do I just need to add coolant through the radiator cap instead??- excuse my stupidity- I have never had a nice liquid colled bike before.

Thanks in advance for your time and consideration-

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post #2 of 3 (permalink) Old 07-11-2005, 10:09 PM
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Make sure you didn't dislodge the radiator cap from the radiator neck. I have a buddy with a zx-9 that this happened to but don't know if the twelve would have the same vulnerability due to location inside plastics. It's likely to be something like that, not holding pressure in the system. Good luck.

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post #3 of 3 (permalink) Old 07-12-2005, 05:37 AM
Join Date: Mar 2004
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I'll go with Dad on the rad. cap. It could be dislodged or it could be mildly damaged (It has a valve in it, sort of). Aside from that check all your hoses to make sure none of them are out, tangled, or whatever.

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