RM Guy,
That's interesting that the SDG seat is the same height as the stock 01 RM250. The SDG guys had told me, a year ago this Oct, that they knew the preference would be towards the 125 height, and they were going to build the seats in the taller height. On the positive side, you will find that the stock seat is likely shot and simply getting new foam will boost the seat height a substantial amount. In fact, even the stock 125 foam flabs out and lets you feel the frame rails on good hits.
Thanks for the report. It looks like the kid is going to accept rider support from Factory Effex, so we'll be running the FE tacky seat cover and foam. I'll give a report when we get it.
Meanwhile, I see where the new 02 RM's have the same seat mount sharpness problem as the 01's. Grrrr.... Get out the file and take care of the trouble. The airbox needs a couple more rivets, too. I'll try to find the Dirt Bike issue which describes the fix and post it for the troops.