A GX150 series Yerf-Dog has the best climbing ability out of the box because of its light weight, large valve head, 13/40 final gear set and 13t engine drive sprocket. To make it a monster add the following:
22" tires on all four corners for clearance w/ 39t axle sprocket to compensate for those taller tires
Fresh air intake, performance exhaust, A12 torque cam and carburetor rejet to make the engine flow better
12g variator slider weights with the red main torque spring to keep the RPMs in peak range
If you have deeper pockets, there are ported heads, big bores and stroker cranks available...
Hills will not be problem no mater how long as long as you can keep traction.
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