Looking at 2 jet skis. One is a 1996 Seadoo XP in good condition, new SS impeller,VTS for 1400. The other is a 1998 Seadoo SPX good condition, no known problems for 1800. Both have trailers and are well taken care of. I assume i want to check the compression and buy the one that has a even 150 psi compression in each cylinder.