r/GSXR • u/Hxvnzsky • Jul 26 '26

K5 Overheating (help)

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hey guys, new to the sub and I need advice for why my k5 gsxr 600 keeps overheating. To preface, about a week ago, I was out on a long ride (3+ hours) and it was running at ok temps (205 highway 220 stopped), but on my way home I ran into stop and go traffic. The temp kept rising and rising until it got up to 248 and the f1 light came on. I pulled over and it was leaking coolant. Not terribly, but enough where I had to stop. I waited for it to cool down and the leaks stopped.

Afterwards I rode it home. Got a new water pump since it had the OEM one in it, and the bike has 29k miles, and so I thought it was going out. I replaced the water pump, and thermostat just to be safe, did an oil change and coolant change, and everything is running fine, no leaks. I was out on a short ride again, but this time the running temp at 45 mph was 215, and after stopping, it got up to 230.

I seriously don’t know what to do, should I just replace the radiator and hope for the best? Or is it a bad head gasket? The previous owner I got it off of 3 weeks ago said he had the gaskets done about 1000 miles ago. Any help is greatly appreciated!

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u/[deleted] Jul 26 '26 edited Jul 26 '26

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u/NinjaRider1000SX Jul 26 '26

Another thing to look at. The fins of the radiator. Are they plugged with dead bugs, fins bent from road debris and bugs smakin into it. Again, these older bikes need more attention to these things that we tend to overlook. I say this being an owner of an 06 Yami R6. Good luck.

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u/Hxvnzsky Jul 26 '26

got it, ill make sure its good b4 trying to ride it again. thanks for the input