have a 2002 Honda xr100. When i start off i ride in 1st gear and when i shift into 2nd, it goes into neutral. So i down shift back into 1st gear and start off again, up shifting a little harder to second but it still wont go into 2nd gear. It just revs up in neutral. Every now and then it goes into second but its just being dumb right now. Please help me and tell me what the problem could be.