Hi all any help you could give would be appreciated. I'm having some problems with my dirtbike. for starts it's a 1979 RM125, so I'm not suprised it's acting up. anyways the problem is that is has absolutley no power down low. It's difficult to say the least to get it rolling, if it's on a hill you can pretty much forget it. Once a full head of steam has been acheived it's pretty good. In order to launch the bike you've got to basically leave on the power band, full rev's with a lot of clutch slipping. If you're on a hill or you don't slip the clutch enough it stalls. I've cleaned the carb and it looks good. starts fine. The plug looks pretty good a little oily with some carbon, though the spark didn't seem paticularly big, rather small and suprisingly it was orange..not blue, i'm not sure what that means. Can anyone give me any suggestions on what may be causing the problem and perhaps if possible how to tune it for more bottom end power?