kinda hard to answer, all depends what your gonna do with the cart. wheel size, gearing, top speed, etc. it all cost money, Honda or Briggs v twins are a grand or more. different drive clutch, engine cradle, exhaust all adds up quick. can you do the engine work yourself? more and more campgrounds are not lettin' the v twins in anymore
one can get 16hp out of a 295 with the right parts for about 800.00 if you the work and around 1500.00 for a complete bolt in deal.