rm125 dirtbike?

my power band is not kicking in on my 93 rm 125.what is wrong with it

first get a manual and read it ,,Check air filter,, must be clean..Check spark plug electrode color,, might be to lean or richCheck compression.. might need top end rebuilt.Check power valve in exhaust port..might be gummed upCheck exhaust pipe,,no dentsCheck spark arrester,, make sure it is not plugged upKeep it simple and remember the basic of a 2 stroke ..