shaneohio21
Recruit
- Joined
- May 12, 2015
- Messages
- 3
Ok this is my first post and i have read thru 100 or so post on this problem so i thought i would ask and narrow it to my boat and motor specific. I recently bought a 24 ft 1996 sea nymph pontoon and it has a 90hp johnson 1986 V4 we have been out on the lake a few times and the previous owner said something about it cavitates since researching i have looked at all the likely problems and started to self diagnose so far here is what i have done and the results/symptoms. First when on the lake at about 3/4 throttle motor stands right up and takes off the last 1/4 the rpms spike around 6k and motor winds out really loud and i get no extra speed when i back the throttle back down it picks up and pushes on so first i tried to move the trim and i am unable to even slightly move it without this rpm spike and no more speed so i keep it all the way down. after this i saw i had an extra mounting hole left to drop the motor a little lower so i did now the stingray thing on cavitation plate sits about even with bottom of the toons . looking at the boat in the water it seems to sit right also this problem occured with one other person as well as 5 others in the back of the boat, so after this all happened the little bit it lowred it still does it the prop is 14x13p alum it does show signs of where on blades and the edges are chewed up some so after the research today i ordered a 14x11p prop. not sure its the cure but seems the cheapest route first sorry this is so long just something that is keeping me awake at night worrying whats wrong.when i do put it full throttle u can definatley tell its reving and not pushing water. any help is greatley appreciated the old owner mentioned a guy told him a jack plate but to me it seems low enough.