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Discussion Starter #1
Long story, short version...dealer don't stock and I need to drive the bike. I've done this over the years with cars and no ill effects (till winter, gets cold).

Thanks for your advice.

Bonzi
 

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2005 K1200LT
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Don't know - but I have had cars (MGB) that would over cool if you did not use a restrictor plate. I would say give it a try, just realise it will most likely take longer to get out of the initial "rich" start up condition. Just monitor the temp for abnormal behavior.
 

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No Thermostat

DefinitleyNot!No engine should ever be run without a thermostat!All engines are designed to run most efficiently at certain temps,thr thermostat makes sure it is at a constant temp.Sure ypu may get by with it for a short time,but you will have hot or cold spots in diff. areas of your engine.Also really bad for marine deisels,running too cool don't get proper combustion.
 

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bonzi said:
Long story, short version...dealer don't stock and I need to drive the bike. I've done this over the years with cars and no ill effects (till winter, gets cold).

Thanks for your advice.

Bonzi
For a relative short period until the replacement thermostat is in, go ahead -- but keep an eye on the temp gauge. You want to ensure the coolant temp gets up into the normal range most of the time -- the reason is that if too cool, the temp sensor at the rear of the cylinder head will tell the Moronic that the engine is cold, and the Moronic will go to the cold/start/overly-rich fuel map; after a while, this will lead to carbon-fouled plugs, and potentially overheat the catalytic converter (from unburned fuel oxidation (burning) in the cat).

Not something to do for a long time, but a manageable "emergency" condition.
 

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Discussion Starter #5
thanks

I'm going for a short spin to check out the temp gage. Dealer said he could get me a new one in a day or so.

thanks again,

Bonzi
 

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I would not do it, but if you do, be very careful to watch the temperature carefully. My experiences in the past with cars was that some will run too cool, but believe it or not some will actually OVERHEAT with no thermostat!

The reason is that the hot water has to stay in the radiator(s) long enough to transfer it's heat to the air passing through. If a cooling system pumps water fast enough this cannot happen, and the water temp will continue to rise.

Running any engine without a thermostat is a sure recipe for either reduced performance, or damage.
 

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Discussion Starter #7
looks good to go

at 82 degreesF @ about 60 mile per hour the needle points half way between the first white block and the half way mark. Got stuck behind a line of cars and a tractor for some first gear stuff for about 10 minutes and the needle went to the 3/4 mark, than returned to the before mentioned mark when under way again. This should be ok, yea?

Thanks folks,
Bonzi
 

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bonzi said:
at 82 degreesF @ about 60 mile per hour the needle points half way between the first white block and the half way mark. Got stuck behind a line of cars and a tractor for some first gear stuff for about 10 minutes and the needle went to the 3/4 mark, than returned to the before mentioned mark when under way again. This should be ok, yea?

Thanks folks,
Bonzi
That is fine for temporary use, but I would get a thermostat re-installed at the earliest convenience.
 

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seems like I once read an article that said too fast thru a radiator was a myth. They said whenever they did not get enough cooling that they sped up the water pump. It went on to say (if I recall correctly) that the situation caused by no thermostat was cavatation around the pump where air would be introduced and not allow the water to be pushed properly. Not saying this is gospel but thought I would throw it out for fun. Would definitely replace the thermostat as soon as possible for the proper running temp reasons already stated.
 
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