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I noticed this when I start my 98 900 when it's cold; when it is not in gear, the rpm's drop slightly when I release the clutch. I never noticed this before. But it's -10 here in Vermont, and I've been prestarting in the morning. :eek:
 

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As well it should. And there may be no compensation for this as there is for the AC compressor..

But how is the quality/viscosity of your MTF ?
I hope it is not the old, old 80-90 wt near grease from the 50s and 60s..
 

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Earthworm's probably right. When you let the clutch out, gears in the transmission have to spin up in the cold oil, putting a load on the engine and causing the RPMs to drop. Once it all warms up and the oil thins out, it shouldn't have as much of an effect.
 
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