The other day after adding more gas and putting the same amount of oil in, by bike started to sound diffrent. The sounds hard to discribe but its almost like the bike cant hit the power band. IVe got a 1999 Kx 125. Can any one tell me why my bike suddnly started sounding difrent? Its still got the same amount of power..... maby even a bit more but when i rev it up the revs come down really quik. Thanks.