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Old Jul 8th 2017, 11:49 AM   #1
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Coolant Overflow - Bad Radiator Cap?

Issue just started recently with 2012 1199 - After shutoff when hot (~200F) coolant reservoir tank bubbles and overflows via the lower fairing overflow tube.

I've been reading that this is most likely a leak in the coolant system. Have not been seeing smoke in the exhaust or leaks anywhere so I'm going to try replacing the radiator cap first. If that doesn't solve it, probably take it in for a coolant system pressure test. Only problem, I cannot find a part number for the OEM radiator cap. Any suggestions on where to look or should I attempt to get this direct from the dealer?

Last edited by Bakersdozen; Jul 8th 2017 at 11:51 AM.
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Old Jul 8th 2017, 02:28 PM   #2
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coolant overflow

I am not a radiator expert, but it might be that after engine shutdown/no coolant flow, there is some heat soak of the coolant that makes it boil/expand further, and causes a little overflow from the tank. I have had cars that have done that before. The solution was to not refill the overflow tank when it cools down, and the tank can then absorb the extra heated/expanded coolant with further overflow.
My way of filling the coolant tank, since I can't reliably see the level in the inner sight panel, is to fill it cold until it runs out the overflow. When it gets warm the next time, some coolant is lost, but then the overflow tank is as full as it can be when hot, which I think is what is intended. Anyway, my bike hasn't overheated or misbehaved yet.
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Old Jul 10th 2017, 08:32 AM   #3
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Bike has not been overheating, just trying to make sure if the boiling coolant overflow is normal....?

Last edited by Bakersdozen; Jul 10th 2017 at 10:10 AM.
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Old Jul 10th 2017, 03:55 PM   #4
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Originally Posted by Bakersdozen View Post
Issue just started recently with 2012 1199 - After shutoff when hot (~200F) coolant reservoir tank bubbles and overflows via the lower fairing overflow tube.

I've been reading that this is most likely a leak in the coolant system. Have not been seeing smoke in the exhaust or leaks anywhere so I'm going to try replacing the radiator cap first. If that doesn't solve it, probably take it in for a coolant system pressure test. Only problem, I cannot find a part number for the OEM radiator cap. Any suggestions on where to look or should I attempt to get this direct from the dealer?
I doubt it will be your radiator cap. If you do buy a new cap, if you splash out some extra you can buy the genuine 1199 SL cap and save 10 grams. Really nice looking piece.
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Old Jul 10th 2017, 06:55 PM   #5
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If you replace rad cap and still does it HG time.
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Old Jul 13th 2017, 10:16 PM   #6
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Had a prob with my cap the rubber perishes changed the cap and gixed the problem
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Old Jul 14th 2017, 03:04 PM   #7
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Same thing happened to mine last year. Took the bike to the dealership (3 hours away) and they found it was the cap on the 3rd trip there.
First 2 trips they didn't find anything that would cause it and of course there were diagnostic fee that had to be paid. On the third trip, after 1100 miles, 20 hours of driving and several hundred dollars, they discovered it was the cap and they gladly covered it under warranty.
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Old Jul 14th 2017, 04:00 PM   #8
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Radiator cap and waterpump replaced. Still overheats and I see coolant drops under tge bike when parked. Any suggestion are welcome.
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Old Jul 14th 2017, 05:52 PM   #9
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If your getting over temp light and constant bubbles in the coolant = HG
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Last edited by Halo2; Jul 14th 2017 at 10:08 PM.
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Old Jul 15th 2017, 12:39 AM   #10
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Originally Posted by Bakersdozen View Post
Issue just started recently with 2012 1199 - After shutoff when hot (~200F) coolant reservoir tank bubbles and overflows via the lower fairing overflow tube.

I've been reading that this is most likely a leak in the coolant system. Have not been seeing smoke in the exhaust or leaks anywhere so I'm going to try replacing the radiator cap first. If that doesn't solve it, probably take it in for a coolant system pressure test. Only problem, I cannot find a part number for the OEM radiator cap. Any suggestions on where to look or should I attempt to get this direct from the dealer?
87220892AA Part number for the 1199SL Titanium cap. You will not regret it. Lovely piece.
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