Motorcycle Repair: my bike booggs, fuel mixture, powervalve

Question
i have a rm125 and when i first go to go off i crack on to it and its very boggy and clean the spark plug and setted the carb right and put new gas in it but it still boggs whats wrong??

Answer
Joel,

-have you checked the air filter?
-also make sure it has good compression
and you may want to read up on power valves
as they can have problems.
http://www.dansmc.com/powervalve.htm
-sometimes it is just a good carb cleaning
that is needed.
-a plugged pipe can cause trouble.
-an air leak on the carb, intake or
a bad engine seal can cause a lean fuel mixture.
-browse some of the dirtrider forums online
and you may find useful info.
-Look up a spark plug color chart
online and it may help you diagnose
if it is running rich or lean.