GY6 bolts right up, no modifying needed
Reverse is easily installed on GY6
Internal as well as external gearing changes are possible
Many aftermarket parts available for the engine/trans combo
Those that normally do conversions, look into snow mobile or 4 wheeler engine/trans combos if you're going to go that deep into a conversion.
And if you use the Yerfdog Spiderbox as your platform, be prepared to make many reinforcements to the frame, ball joints, and spindles if you're going to be adding more HP. They have issues of cracking/bending with just normal 150cc HP.
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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