i have a 4 seat setup with vfj mod and his clutch weights. it is awesome.
he asked alot of questions to set this up. it has a little stall before take off bu it gets it done no matter what surface or speed im riding at. I pulled out an elk in rockey/ muddy condithions up hill no problem.
if you get his clutch weights and springs he will ask you if its a 2 or 4 seater, what after market stuff does it have, lt or stock axles, tire size, ect, and set up the proper springs and weights for what you want.