I have a Seadoo HX with a 155 4tec engine in . Iíve put a XPl pump shoe in and fitted a 148mm setback magnum pump . Any ideas guys on impeller pitch . Itís pulling 7900rpm ÖI am putting in a 88/89 ring to open the pump up to get the revs up to 8100 . Any ideas with pump tuning ideas , pitch , would a small pump work better ?
Thanks in advance