Here's a device I use for oil changes:
http://www.crfsonly.com/forum/viewtopic ... highlight=
Since that post, I've added a 150r and 250x to the stable.
For the 150r it works great for both engine and tranny. The tube goes into the dipstick hole easily and gets about 98% of the oil. For the tranny, I laid the bike on its right side, and was able to get the smallest tube into the tranny hole and suck the oil out. Got it all except for a few drips when I put the bike upright.
On the 250x, the engine oil was the same as the 150r. However, on the tranny side I could not get the smallest tube into the drain hole, so I'm looking for a way to more easily facilitate that as well.