Hi Mate
There is a section on this site that tells you how to adjust the rc valves here http://www.nsr-world.com/tuning/250-tuning/engine/
I adjust mine the HRC spec way
The normal operation of the power valve servo when you run the bike turn it of and then turn the key on the motor should turn to the lo position turn of unplug the t.p.s and turn key on should turn to hi possition
Hope this helps