The grinding noise is probably be a hub going out, they normally make more noise in turns. If it's louder turning right, then your left hub is going out, if it's louder turning left, then your right hub is going out. Actually, the bearing in the hub is going out, just there's no way to replace just the bearings, so you have to replace the entire thing.

As for not starting the first time, if you haven't, you probably need a tune up. Plugs, wires, air filter, fuel filter.