I have a 2009 18.5 foot crownline with the Mercruiser 5.0 V8 220 HP I/O engine - this is our 4th season with it - ever since the 2nd season it seems like it doesn't have the power it should - this year it seems even worse. For example - today was towing two 12-year old girls on a criss-cross tube (flat with slightly elevated wings) only two adults in the boat - it really struggled to plane - had to have passenger go up to the bow. Don't have much experience with boats and have had this professionally winterized each year. Help!
