ZZR 600 coolant overflow. High temp?

[vifferman]

have it another go, the radiator cap seemed fine and i filled it up with water direct to the radiator and to the full mark in the tank at rear of bike,

let it run for a while and gave it some revs like riding would do and eventually it started to heat up quite quickly, got half way up the temp gauge then the level at the overflow tank rose a bit then after some more revving it headed up lots and stared pouring out the top overflow hose,

turn off, no fan goes on and hear a gurgling/hissing sound, not sure if theres a breach in one of the hoses or if its internal....

When you fill up the radiator, you also need to 'burp' the system - you can get air bubbles in some of the passages which prevent the coolant getting through - it's called "vapour lock". (This could explain some of the weird gurgling noises you heard).
To avoid this, you need to fill the radiator up, start the engine, and gently squeeze the radiator hoses while blipping the throttle. Then top up the radiator and repeat. Last of all, put the cap back on then top up the overflow bottle.
If you still get the same thing happening, then there's something more sinister afoot, like a volcanic eruption under the sea leak somewhere (head gasket?) or the waterpump's faulty. Time to take it to a workshop.

[josiahisyoung]

yer ive got a full manual so hopefully i can figure out how to do what youve said once i find the time,

[josiahisyoung]

I had a look and cleaned out he connections to the switch and jst to test it hookd the fan to the horn so i could manually turn it on, so i did the same test with fan and it still boiled over, not as much and was slower but still overflowed!

so even when the fan going its happening so i have no idea why it is heating up that much and getting forced into the coolant tank like it is

[vindy500]

we just talked to richard (from richards motorcycles) he reckons its prob the headgasket, how hard a job is this to replace? is it just a matter of unbolting the head and popping a new one on?

[howdamnhard]

so even when the fan going its happening so i have no idea why it is heating up that much and getting forced into the coolant tank like it is

Bugger so it's not the fan. Get the cooling system pressure checked. Check your oil, is it white and frothy? Give George of Motorcycle doctors a call on
0800 668 663. He can come around to you and check it out. My ZZR600 is currently playing up to,leaking oil out of waterpump tell tale hole. Good luck on getting your bike sorted , they are good fun when they go, just a little heavy and soft in the front.

[NinjaNanna]

How full is the overflow bottle to start with? An optimally working cooling system always pushes some water into the bottle as it warms up, then sucks it back in as it cools after you switch the bike off. IF you have the bottle filled really high then of course you'll get overflow out of the bottle.

Have you checked the radiator cap? If she's stuffed then it won't hold the neccessary pressure so much more water will be forced into the overlow bottle then should be.

Finally when you tested the fan were you still getting the the air bubble noises?

I had a look and cleaned out he connections to the switch and jst to test it hookd the fan to the horn so i could manually turn it on, so i did the same test with fan and it still boiled over, not as much and was slower but still overflowed!

so even when the fan going its happening so i have no idea why it is heating up that much and getting forced into the coolant tank like it is

[NinjaNanna]

well????? what was the verdict

[vindy500]

well????? what was the verdict

Jo's taken it into the shop, havent heard anything more than that

[_STAIN_]

these things don't blow head gaskets... and "looking" at the radiator cap is not a way of replacing it, as has been recommended to you by a couple of knowleable people here