Thanks for the info and ideas.
I got the bike and rode it bone stock for one afternoon. It's just to dang fast in first gear for the billygoatin' we end up doing some days. I like the power though. It was super skittish the first day, and I just attributed it to being a 250. I got back home after the first ride and some moron at the dealer had the rear tire with 38 pounds of air, and the front with 32... I dropped it to 12 front and rear, and may drop the rear to 10. So far at 12 and 12, it's been a joy to ride. The tire took a licking though when it was at 38 pounds, wore like it was made out of paper towels... that's kind of a bummer. Wish I had looked sooner.
I've got a wr250f, a regular 250f and a yz125 I've converted for the same riding, so I have a rough grasp on what I like to see the bike do.
Here's what I've actually done to the bike so far.
13oz flywheel
-1 tooth on the c/s
+2 teeth on the rear
FMF Gnarly pipe with shorty silencer
complete emig triple clamp with the rubber mounts
pro-tapers (I think the windham bend). with bark busters
First gear is STILL right on the edge of being to fast for what we ride, I'm clutching more than I like in the slow stuff to keep the bike speed down. The torque is AWESOME!!! For hill climbing in the rough junk we have here, I can start in 2nd, stab 3rd and idle up to the bottom of the hill, wick it, and the bike is on the pipe and I'm haulin up the hill. Power to the ground is beautiful.
I have noticed that about twice racing back to camp on some wide open stuff that I wish I had one more gear on top, but not for more than 10 seconds or so per day, so I'm not going to worry about that.
I'm toying with cracking the cases and changng first gear down a shade, leaving 2nd, 3rd and 4th and changing 5th. Anybody know if those kinds of gears are even avbailable? What about the tranny, tell me there is some silly spacer on the shafts with the gears that can be removed and you can add 6th to the bike. :)