Cooling system maintenance - ZX6R Forum
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post #1 of 8 Old 08-22-2019, 11:25 PM Thread Starter
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Cooling system maintenance

According to my 2016 zx6r manual, I need to replacement the coolant hoses and cooling system related o-rings every three years or 25,500 miles. Do you guys still replace the coolant hoses even though they look ok/new? What about the o-rings?
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post #2 of 8 Old 08-22-2019, 11:48 PM
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My '09 has all original hoses, o rings and clamps. Good or bad, that's worked for me...

"Basic stuff fellas. Use your head for something other than to break your next fall."
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post #3 of 8 Old 08-23-2019, 01:10 AM
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The manual says a lotta things.

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post #4 of 8 Old 08-23-2019, 10:30 AM
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Originally Posted by davidvu90 View Post
According to my 2016 zx6r manual, I need to replacement the coolant hoses and cooling system related o-rings every three years or 25,500 miles. Do you guys still replace the coolant hoses even though they look ok/new? What about the o-rings?
I routinely see bikes 10 years old and many much much older still with original hoses etc......... without issue

But, I have also seen some bikes sub 10 years old that hoses with bulges or have even burst

So while I agree with some of the timeframes in the service manual........there are some I think should be shorter and some that can certainly be longer

I imagine some of it is lawyer based and other stuff warranty based, both balanced against cost of ownership based....
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Stupid people say stupid things on the internet, so be wary of who those people are. If you solicit advice on the internet, just keep in mind 99% of what you'll receive is not based on fact or science-and likely atleast 95% of it is based on bullshit and bravado regurgitated from some other schlub who also did not experience any of what they claim and are also full of shit. If you don't like my bluntness- too bad. I am not here to please you, so move along, your approval is not desired nor is it needed. So before opening your pie hole and adding more stupidity, perhaps sit back, listen, absorb and learn something. You know that saying, it is better to remain silent and thought a fool than to open your mouth and remove all doubt!
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post #5 of 8 Old 08-23-2019, 11:22 AM
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Originally Posted by RJ2112 View Post
My '09 has all original hoses, o rings and clamps. Good or bad, that's worked for me...
+1. My '98 looks to still have the original hoses and they are in good condition with no weathering or cracks. Mileage is low at just over 49,000km but it is still a 21 year old bike. Based on the condition of the bike I would say it was stored indoors its whole life which probably makes more difference than anything else. Bikes age fast when they live outside all the time.


Mark

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post #6 of 8 Old 08-23-2019, 01:55 PM
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(I know I'm preaching to the choir, still a good conversation for folks lacking the background)

No matter where they are stored, eventually the compounds that make up the hose will become stiff. Almost all plastic parts (synthetic rubber, too) out gas in the same way fuel does. The smallest molecules in the blend evaporate most easily leaving the longer heavier stuff behind. The aromatics leaving the plastics in a car interior are partially responsible for the film of stuff that forms on the inside of the windshield.

As long as a hose is not disturbed, it will maintain the same seal it had when young and healthy. The older and stiffer it gets, the less flexation, and compressible it will become. Re-using an old hose or gasket reaches a point of diminishing returns where more clamping force does nothing for improving the seal. This is also true of gaskets.....

The 'redneck' solution used to be to trim off the brittle part, and re-use what remains. So long as there is sufficient slack to make the connection, it's a viable fix. Modern manufacturing does not impart significant excess, the opportunity to use this solution is ever smaller.
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post #7 of 8 Old 08-23-2019, 09:05 PM
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As long as a hose is not disturbed, it will maintain the same seal it had when young and healthy.
So true. If I have to pull any of the coolant hoses on the '98 I will be replacing them. They are surprisingly pliable still but there is no way I would trust it after being removed at this point.


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post #8 of 8 Old 08-23-2019, 10:00 PM
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The pliability of the fork seals...... I hypothesize that the seals need to be wetted with fork oil in order to maintain their seal. When a fork doesn't move at all for long periods of time, I believe the outer side of the seal dries out and looses its elasticity. Not a big deal in terms of days, weeks, or even months.... Certainly it takes very few years of standing to compromise them. As we're are discussing, environmental factors must also play a role.
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