10hp is realistic- With the CVT mod's on a GY6(lighter rollers,heavier springs) will get you up the hills along with an axle sprocket change-but your topend suffers. For me there's no comparison to a transmission for low end torque and higher top speeds- thus my engine changes to Honda TRX200SX (semi-automatic). No doubt a 2-stroke will give you the power needed to get up the hills by simply having an abundant amount of wheel speed and a light weight power plant. If the snowmobile option is on your mind- find a Polaris transmission instead of the sled gearbox to get you reverse.
Warning!!!! if you get a buggy that will handle those hills - you'll leave the bike on the trailer!!!!!
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