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Discussion Starter #1
I run distilled water and water wetter in my track bike. I notice after a track day I'll have to add some to get it back to at least the minimal level in bottle. That's where I normally keep it. So it uses some during the track day. I don't seem to be leaking any and it doesn't seem to go down while the bike is sitting around. Is this pretty normal as the water heats up and evaporates some? My father was telling me in a closed system there shouldn't be evaporation and since it's not boiling....
 

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The system is designed so that if there is sufficient temp/expansion/pressure while running, some water will get past the valve in the cap and go to the secondary tank between the cylinders. When the engine cools down, it sucks it back again. So you shouldn't see any loss beyond minimal losses to evaporation.

Next time you run, keep an eye on the level in the tank after every session to see where the level is. If it doesn't get to the top and you're still losing water, you have an internal leak. Water in the oil will collect as a milky emulsion in places where the temp doesn't exceed 100C, like under the filler cap, but you may not see it if the quantity of water is small. Most likely candidates for the leak are cyl gaskets and water pump seals.
 

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Discussion Starter #3 (Edited)
So you run water water/distillled water and don't have to add water every track days?


I'm wondering if maybe the upper tank is starting to leak and is gonna really go at any time. Just guessing if I'm not supposed to be losing any.
 

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There should be no need to add water regularly after a track day. You probably have a small leak somewhere. The main expansion tank behind the steering head is the most likely culprit. Keep a spare in your trackday parts kit!
 
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