Yeah you can go -1/+2 or just a +2 or +3 rear and leave the front alone. It depends on how much more acceleration you want. Also consider that if you do a lot of highway riding you will always be in a higher RPM the more you gear for accel. This also translates into worse gas mileage.
I was going to do -1/+2 but no one had sprockets that I wanted in stock, AFAM or Renthal was all I'd use, no Vortex sprockets. I was able to get 0/+2 though with Renthal and that has been great. I also went with a DID ERV3 520 chain. Depending on your milage and the sprocket sizes you will want to get a new chain. If your chain is new then you might be able to stay stock but if you've got some miles on it you'll want to change it out. Also I think you can only stay stock if you go like +2 or +3 but if you -1 up front too you'll have too much slack on the stocker.
EDIT- the basic rule of thumb is that -1 front equals +2 or 3 (usually 3) rear. So a -1/+2 setup is the same as going 0/+5.
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