Today i ride with my friend. With 1 gear to 3 gear with 10k rmp i get 120 km/h without problems. But when i go to 4 gers, speed not up and rmp too. If i low speed, to rmp get only 7k and again. Not to go up.. With 5 speed + he start conk out when i try get full rmp.. This is power valve? or no?? Dunno.. If this is power valve, can u gimme manual . For fix it and setting up.. Sorry, my english is bad.