hi there when i ride my 2000 yz426f on low rpm, the engine turns off. its only low speed, specialy when i ride on rocks - so i have to ride with half clutch and it kills my arm n my clutch. is there anything i can do? i ride 15/49 and stock jettings . the bike runs great. at the beggining i tought it was my bad riding but i asked two of my friends to ride it and they had the same prob. what should i do?