I purchased a 2001 DRZ 400s a couple of months ago and have used it for commuting around town but now school has started up and i commute about 20 miles, 90% of that trip being on highway and i would like to change the sprockets to help the bike on the highway. I believe the bike has stock sprockets as it screams at 65-70mph (15/44). How might i go about making the bike easier to cruise on the freeway around 70mph. Thanks so much in advance. Tl;dr: I want to make my drz 400s more capable of freeway riding, how do i do it?