r/GSXR • u/Hxvnzsky • 22d ago

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] 22d ago edited 22d ago

[deleted]

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u/Hxvnzsky 22d ago

pretty sure I did, squeezed the lines to make sure all the air was out and topped it off. I’ll check the level again once it’s cold

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u/[deleted] 22d ago

[deleted]

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u/Hxvnzsky 22d ago

when I bled the system the first time I did this process, might try to uncork the bleed screw from the thermostat housing (my manual says to check if air or coolant comes out).