Will the stock chain work if I go down a tooth on the front? I think my chain is pretty much wore out so I just need to know what size to order. Stock or ??? I rode in a harescramble this weekend and noticed I was using first some, a lot of second, some third , and a little forth. It would be nice if I could use just 2,3&4. 2 gear was just to high for some situations. Thanks CJ