K1200RS head skim question - K-Bikes.com - Excellence in Motion
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post #1 of 18 (permalink) Old May 7th, 2014, 5:02 am Thread Starter
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K1200RS head skim question

I had a holed rad the other day whilst blasting down the motorway at 90 odd, and lost all the coolant in my bike. Naturally this caused an overheat before I realised and blew the head gasket.
I am having the head inspected tomorrow and hopefully it won't require a skim but if it does, will I need a thicker head gasket? I can't seem to find information about this anywhere. Are there even thicker gaskets available?
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post #2 of 18 (permalink) Old May 7th, 2014, 2:42 pm
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There is very little opportunity with these modern engines to do do the sort of things done years ago at an economical price. Cranks and regrinds are in a similar category.

These are not super high compression engines. Check the valve clearance to the pistons and you could probably get away with a 10 thou skim. If your heads are much more warped than that, you are probably looking for a new/used head. Presumably you missed the gauge and red warning light in the cockpit? Running out of water is as bad as running out of oil.



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post #3 of 18 (permalink) Old May 7th, 2014, 10:27 pm Thread Starter
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That's the weird thing - the gauge didn't actually go into the red (though it got close) and the warning light didn't come on at all. I think they only work properly if there is still water in the system. Certainly didn't warn me in time
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post #4 of 18 (permalink) Old May 7th, 2014, 10:29 pm Thread Starter
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post #5 of 18 (permalink) Old May 7th, 2014, 11:13 pm
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Quote:
Originally Posted by Smegger68
That's the weird thing - the gauge didn't actually go into the red (though it got close) and the warning light didn't come on at all. I think they only work properly if there is still water in the system. Certainly didn't warn me in time
Hum...I had something like that happen with the old van. Sensor was on top of the engine, didn't seem to read all that well without coolant. Only warning was that the gauge was erratical from normal to hot and down/up/down again.

May be the same with the Ks?...The ECU will turn on the warning light. And that's the sensor in the back of the engine head so kind of high up.No or low coolant and the readings could be erratical.

Gauge is the sensor under the water pump so should be some coolant left down there. May be possible to tee another sensor down there and have it only for a warning light. Or maybe even use the existing wire from the sensor to trigger a light.

Hum scary...busting a coolant hose may not give much warning, same as a hole in the rad. And one of my hoses sure rubbed on the bellypan fasteners back then. May have been just about ready to bust. I replaced it but only saw the rub marks after a good winter inspection,otherwise I may never have seen that.

I'd like to see the progress. Does your bike have a Facebook page? I don't.

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post #6 of 18 (permalink) Old May 8th, 2014, 2:24 am
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Skim Head

Quote:
Originally Posted by Smegger68
I had a holed rad the other day whilst blasting down the motorway at 90 odd, and lost all the coolant in my bike. Naturally this caused an overheat before I realised and blew the head gasket.
I am having the head inspected tomorrow and hopefully it won't require a skim but if it does, will I need a thicker head gasket? I can't seem to find information about this anywhere. Are there even thicker gaskets available?
There is no way you need to worry about .010 off the head , you will have plenty of valve clearance left . you probably only will get .005 or so off for the high spots , depending on who sets up the mill to cut it .
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post #7 of 18 (permalink) Old May 8th, 2014, 5:42 am
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The OP may get a performanve boost with the higher compression but may have to use higher octane gas or slightly retard the timing if the motor pinks then under load.

Quote:
I think they only work properly if there is still water in the system
Yes this can happen. The scenario is water boils away but is producing steam and you only need a small amount of residual water to produce steam. Under pressure, any coolant in the system is forced out from a leak point very quickly. After that when there is no water and no steam the sensor probes are sitting in an air space. The surrounding overheating cyl.head would need to get to an extreme temeperature before air around the sensor probe was hot enough to trip a warning. Monitoring the cyl. head temperature would be more meaningful. However before this scenario occurs, the temperature gauge usually starts fluctuating around as steam gets trapped in the coolant flow.

A temperature gauge swinging about erratically, followed by a static low reading is the warning sign of impending doom.



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post #8 of 18 (permalink) Old May 9th, 2014, 8:54 pm Thread Starter
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Well the head is going to get a light skim apparently, will fill you in with the details when I get it back on Monday.
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post #9 of 18 (permalink) Old May 13th, 2014, 6:00 am Thread Starter
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Head had a 12 thou skim in the end. Apparently it had gotten so hot some of the ally had turned white and he had to go a bit deeper than he had thought. Even so, that should be fine.... fingers crossed!
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post #10 of 18 (permalink) Old May 16th, 2014, 10:08 pm Thread Starter
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The head is back on, the cams are back in. Just got to remount the rads and fill the coolant up and we can test start the old girl
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