-1 tooth front sprocket and +2 on the rear sprocket. Leave that copper washer out of there, all it does is choke the flow up and kill power. Doesn't add to bottom end at all.
Barkbusters, skidplate, lower gearing like above and flywheel weight is all I'd add. Like Hughes has said, make sure the jetting is correct especially the pilot and needle settings as there is nothing worse then killing a plug on the trail. It ruins your ride.