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I have discovered sometimes when I open my carb to make adjustments there is a milky like greasy layer/film inside the intake side that I think effects performance. After I clean it it seems to clean up throttle range.

1) What is it?
2) Can I make it go away?

Sounds like you're airfilter may be oiled to heavily I'd pull the filter clean it and re-oil it and see if the problem goes away. It doesn't take much oil

I'm getting the same film on my slide. I thought it was my filter oil, but even without a filter it still gets it. I'm assuming it is from the gas and oil and the high pressure in the carb venturi causing the oil to froth and coat the slide. I bet it also has water droplets in it as well, right? I'd say its normal cause it doesn't seem to hurt my bike. I also noticed the same film on my rm 80 and 125 as well, and neither has an air filter in them ( I start them daily in my storage bldg to keep them lubed). It seems to get coated more the better my bike is jetted, oddly enough.

Is this it?

Water absorbed by ethanol and mixing with the oil.The crap terrorizes the inside of your float bowl as well.

Definitely got some water in there. Either through the filter or through the fuel.

I had noticed a little `milky` residue on my slide when adjusting my needle clip along with a few drops of water in & around the inner slide ( where the needle sits )..on inspection I noticed that my throttle rubber cover above the top of the carb top was torn which would let water in when washing the bike & probably when I ride through any water..since replacing this I haven't had any milky stuff on my slide....worth checking .

Actionman wrote:Is this it?

....Yes