im new to tho jet boat world and i was looking at getting a 1976 fantasy 21 foot with a 455 olds and a jacuzzi for 1500.00 but i heard that the jacuzzi pumps suck and along with the 455 olds if anyone could help me out that would be great thank you.

Yj Jacuzzi jets work very well and are great "work horse jets" they can easily get big boats up and out taking advantage of "smaller motors" and smaller HP (down to around 150 hp) and if maintained will provide years of service .They are not however "performance jets" and don't lend them selves to much in terms of mods beyond the "energizer kits" (AT/Dom conversions) WJ Jacuzzis are fine jets easy to work on and have lots of mods available to them well in advance of an energizer, Any Jacuzzi can be replaced with a Berk/AT/Dom or Aggressor with some bottom work and engenuity, the intake access opening in the bottom of the boat for the YJ is huge and has to be "closed in" the Wj opening is actually too small for Berk style intake and needs to be enlarged (making it fairly simple) we've done all of these "swaps" and are happy to help in whatever you endeavor .. Tom

FWIW theres a couple new jets coming soon to the market that are remarkably similar in design to the much maligned YJ