Here is what my manual says for this 17 hp engine which is a v-twin. Most would run the gap I would think.
VERTICAL CRANKSHAFT COMMAND CV17-750
Spark Plug Type (Championョ or Equivalent) ............................ RC12YC, XC12YC, or Platinum 3071
Spark Plug Gap ......................................................................... 0.76 mm (0.030 in.)
Spark Plug Torque ..........................................///....................... 24.4-29.8 Nキm (18-22 ft. lb.)