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"K12S/KR" Technical Q&A K1200S/R Technical Questions/Answers

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  #1  
Old 03-28-2018, 10:23 PM
Safetyflying Safetyflying is offline
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Pressurized Cooling System

Question about the cooling system on my 2008 K1200S:

Rode my K12S last weekend. I've ridden it a time or two since a few months off for winter and hand surgery. So it has been on the stand for a few days.

Yesterday I noticed a puddle of coolant under the bike. This evening I removed the tupperware and discovered that the leak was coming from the large hose (~50mm) that enters the water pump. Specifically, from the joint between the hose and the pump.

Further inspection found no other leak. When I loosened the reservoir cap, it gave a big burp, enough to spit more from the top. This indicates that the system was still pressurized even after no activity for a week.

Should the system hold pressure that long or do I have greater issues (i.e. blockage) than just a leaky hose clamp (likely old hose that needs to be replace although it is nice and soft).

Thanks for you input.
Stephen
2008 K1200S
~1980ish Honda 650 four
1977 Honda 400Four
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Old 03-29-2018, 01:28 AM
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Beech Beech is offline
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Re: Pressurized Cooling System

Tighten up the clamp and see how it goes, i.e. watch the temperature carefully and see if it goes above normals that you are used to. If so, you will need to drain and refill it under vacuum as mentioned here is several posts. You can do a search for radiator filling. Air gets trapped in small flow areas in the head and can cause hot spots as the flow does not easily move air out. You can open the radiator cap on the right side while on the side stand and see what the level there is. Should be right up to the neck full if not higher.
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Old 03-29-2018, 04:32 AM
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Re: Pressurized Cooling System

Wouldnít it be safer to do a full vacuum refill of the system rather than risk running the engine with possible air locks? I think thatís what Iíd be doing. Over cautious? Perhaps
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Old 03-29-2018, 01:52 PM
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Re: Pressurized Cooling System

Hey, I would too as I have the gear. But I was trying to balance cost with practicality. Of course the best thing is to take the bike to a shop familiar with the procedure and has the proper gear to do it. Or if it is time to check the valves do that and the coolant will be changed.
I know a guy in Nicaragua who has a non vacuum system......
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