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Old 4 Weeks Ago   #1
jbird
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Hello,
Purchased my 06 ST1300 2weeks ago, bought it from an older gentleman that was the 2nd owner and only got the mileage to 23k. It was clean, ran great & had most the extras I liked. Givi trunk, throttlemeister, & Heli riser.
But after just a couple rides I am having coolant overflowing at stops.
It only goes to 3 bars but starts spraying out the overflow.
Have worked on many of my bikes in the past but this being a Honda, low miles, and to date the newest I have owned I didn't expect to have to work on it already.
Hope it's all up from here!
Jbird
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Old 4 Weeks Ago   #2
ligito
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Default Re: new guy from CLE

Welcome to the forum.
I will be 77 next week and can't ride anymore.
I have an '04 ST1300A, with 22 thousand miles.
Love the bike but I need to sell it.
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Old 4 Weeks Ago   #3
PaulRB
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Default Re: new guy from CLE

Welcome.

As far as your coolant leakage.
First check the level in the overflow bottle, left side remove the black tip-over bar cover shin a light up in there and give the bike a shake.
Difficult to see but it can be done. Next time you have the left side fairing off mark the bottle, magic marker, with the level it likes to run at.

The ST uses a Mechanical Seal on it's water pump.
This type seal polishes itself to seal.
It is also known to leak with a drop in temperatures or if the bike has been sitting for extended periods.
Usually the seal will "heal" itself after some mileage has been put on.
This type seal is what dictates the no silicates in the coolant requirement.

Put some miles on and see if your leak does not go away before you tear into things.


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Old 4 Weeks Ago   #4
jbird
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Default Re: new guy from CLE

Thanks for the welcomes.

Paul,
I have checked the overflow bottle & thought it was bone dry.
So I added more before I realized how full it was.
Definitely hard to see thru!

I had not heard about that seal in all the reading as of late.
That could come into play, the PO was elderly & had not been riding much.
I will relax a little & observe.
Thanks for the input!
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Old 4 Weeks Ago   #5
PaulRB
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Default Re: new guy from CLE

Pictures of the seal and more about it and leaks Here:

http://www.st1300.us.com/showthread....echanical+seal


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Old 4 Weeks Ago   #6
jbird
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Default Re: new guy from CLE

Well I had more coolant again, so I had to know where it was coming from.
Pulled all the bodywork, thanks to all the info available for such tasks!
No signs of leakage anywhere, only signs were from where the overflow would normally flow.
let it run till warm, ran through three cycles of the fan cycling on.
No overflow but it was coming close to the top of the container.
I suspect it was a little cooler with no bodywork trapping the heat.

so I took the level down to where it should be cold, replaced the radiator cap, & did a good cleanup.
Took a ride & no more coolant puddle.
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Old 4 Weeks Ago   #7
chaissos
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Default Re: new guy from CLE

Welcome to the forum!

A constantly overflowing expansion tank with no other sign of a coolant leak can be (notice, I didn't says "is") a sign of a leaking head gasket. however, most can (and will) miss those very small leaks, no matter how hard they search.

Pull the plugs, and see if any of them have that tell-tale hue to them. They should all be dark gray if the injection system is working properly. Any other color is a sign of coolant burning. When we used that green Prestone crap, plugs would have a green hue to them. Not sure what the color would be like with the coolant you have.

Regardless, keep an eye on it and see what happens (as I'm sure you will). One thing is for sure: They don't like sitting around for long periods of time. Go Ride!
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