Coolant Resevoir overflowing - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 08-14-2006, 08:47 PM Thread Starter
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Coolant Resevoir overflowing

Hi all, I seem to be having a slight problem with my 06 750. When running the bike at a constant 4-5 k rpm, I am getting coolant that is spitting out of the resevior. When the bike is cold, resevoir level is normal. Temp gauge is less than half way. After riding about 30 min at that rpm I am seeing coolant all over the outside of the resevoir, the cap is on as tight as I am willing to tighten. Any thoughts out there. Im thinking that the resevoir cap isnt making a good seal. Im looking for confirmation or other opinions.

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post #2 of 8 (permalink) Old 08-14-2006, 08:50 PM
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I beleve someone said something about a split in a coolent line or loose clamp causing that, The coolent would go in but air would be sucked back into the motor.
Hope that helps

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post #3 of 8 (permalink) Old 08-14-2006, 09:53 PM Thread Starter
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Ok thanks,, ill check the line and the clamp. it seems that the coolant is comming from under the cap.
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post #4 of 8 (permalink) Old 08-14-2006, 11:16 PM
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What you might do, just to check out your theory on the cap causing the problem, wrap a bit of paper towel around the cap, then cover it in aluminum foil, and tie it on there with a twist tie or wire tire. Just make sure that the aluminum covers the towel enough that no coolant can get on the towel from any place but the cap. After riding, if the towel is wet, then you know it is the cap.

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post #5 of 8 (permalink) Old 08-15-2006, 05:13 AM
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There is a gasket inside of the cap. Try pulling it out and inspect for cracks or dirt.


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post #6 of 8 (permalink) Old 08-15-2006, 07:38 AM Thread Starter
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Yea, rubber gasket is undamaged. Ill try the paper towel idea
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post #7 of 8 (permalink) Old 08-15-2006, 08:45 AM
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On your 06? I wouldn't spend too much time trying to trace the cause. It sounds like warranty work to me!
Possible that the cause is a pressure blow-off because your reservoir should never be full to the point of overflow. Another possible is a loose hose and what you see really starts from around the radiator, just ends up there.

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post #8 of 8 (permalink) Old 08-15-2006, 02:55 PM Thread Starter
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Thanks Dianna, I'll be calling the dealer to take a look at it. It only does it when im running the bike hard. The Res isnt overfull, and the temp gause is usually less than half way when I get this streaking of coolant on the reseivor outside cover
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