So I have an issue and I don’t really know where to start. I have a 2000 250 that hasn’t been cared for to much. But the problem is the chain falls off. Admittedly the chain hasn’t been cleaned and oiled in a while but If I put the chain on to the correct tightness the bike will drive great but if I stop at a light or something won’t roll even with the clutch in, won’t go into neutral either however it will go again as is should once the light changes... If I keep the chain loose the bike drives and shift beautifully, rolls like it should with the clutch pulled and I’ll go into neutral until the chain pops off.