Ive got a problem with my bike that has me very confused. The bike is a 92' CR125, and this problem has just recently appeared after I let my clueless brother ride around on my bike. The problem is, when I have the bike in neutral, and pull the clutch in, the bike lurches forward and the engine bogs. How can this be? The bike idles fine with the clutch still engaged, but when I go to disengage it to shift to first, it seems to have the reverse effect, the bike starts to move. The clutch cable is new and properly adjusted, and the clutch appears to be fine. Any ideas what is causing this?