Hi. I think you will find the stock gearing. If its 14 tooth front and 44 rear will need to much clutch sliping on hills. Ive been to mt nebo in the 80s and there is some nice hill climbs in the area. Stock gearing is great for the road. But terrible on hills bush bashing.
to TTRSLW my 2011 model is legally registered as a single seater through a licenced modifier I was put onto by NORTHSTAR YAMAHA in BOWEN HILLS. all that was done was to remove the seat strap and rear pegs and certify it with Q.L.D TRANSPORT, a LOT cheaper rego. although by now you probably have had the mod' done I assume.