Hmmm, RTM??

Is that an RT with the 'Music' package?? No?

. I guess I should take it that you have a 2010 RT SM5, a
MANUAL RT Spyder; and the fluid that you're talking about is the
clutch fluid??
If this is the case, and if you've changed your clutch fluid at
some time in the last few years so it's not all that likely to have absorbed too much water to work properly &/or swell any of the seals/gaskets...

then I hafta ask - have you checked your engine oil level &/or changed the oil and filters recently??
These Rotax motors are dry sump motors that use a wet clutch system, so the same oil that serves the engine
ALSO serves the clutch
AND the gearbox! If you are low on engine/trans oil, one of the first signs can be difficulty changing gears; and if your oil is old &/or the wrong oil, one of the first signs can be difficulty changing gears...
So you might want to at least check your engine/trans oil (following the correct checking procedure

) to make sure that the oil level is at least mid-way between the
Add and
Full mark -
BUT DO NOT OVER-FILL!! Like all dry sump motors, these things are very tolerant of low oil levels, but they
really don't like to be over-filled!
Good Luck.