I just bought a brand new 2012 CRF150R for my son who is 12 years old. I wanted to make the bike a little more trail friendly so I installed a 9oz flywheel weight and FMF Q4 pipe. Problem now is that the bike does not idle very good and had a terrible off idle bog where much of the time the bike just dies. Im looking for any solutions you may have as i dont have much experience with this bike. Thanks for you help!