Hi...Guys I Have Yamaha R15 2008 Blue Model 13800km done yaar jab bhi bike 7000RPM se upar jati hai toh bike ka throttle same ni rhta bike jhatke marne lagti hai (may be miss fire) aur iske liye engineer ne bike ka fuel pump, fuel injector,ECU,Spark pulg change karwaya aur tappets bhi set karwa ke dekh li but problem abhi bhi hai. m facing this problem from feb 2009. After all This now they have chngd my bikes head assy but problem is still thr...... after all this the engineer is saying your bike is ok! thrs no fault at all...... its a comon thing in all R15 but next day i visit the agncy for chain lube then the head mechanic saying thrs a problem its not a comon thing, guys plz..... help me if any one know the high authority's MAIL I.D or CELL No Thn Plz... give it to me I wana To call or E.mail him. plzzzzzzzzzzzzz...........help me guy's.