I'd like to make my XR400 easier to control in first & second gear for negotiating narrow trails and doing single track. Looks like the stock rear sprocket is 45 tooth. What's normal practice? Will going from 45 to 48 make a noticable improvement? Do I need to be concerned with the chain when putting on a bigger sprocket? I'm a fairly new rider, the XR is my first bike and has plenty of power so I'm leaving it "corked" for now. I'm liking the slow speed narrow trails riding (woods?), no plans for any high speed desert stuff, but I do ride the bike around the city streets a little. Any recommendations y'all can provide would be appreciated.