I have 18.5 Searay Bow Rider 4.3 220 hp I have 21 pitch 3 blade it is slow to get on step but good top end I tried a 4 blade 21 pitch and lost top end, what prop should I use?

Removing the blades is not that easy on my rider.
I am lucky enough to have a 500 lb. chain hoist and a big maple tree in the yard, and can lift the front end enough to get under the deck. But i think those blade bolts tighten up when u mow for some reason.
Have tried several things over the years to hold the blades from turning when breaking those bass todds loose. Blocks of wood, vise grips, and so on, but still end up sometimes with cuts and abrsions. Becuase i can't get the ol impact wrench out to where the tree is, here's what's worked pretty good lately. Come in from the grass discharge opening with a 3" 4 ft. pc. of PVC pipe, i think sch 40, and slip it over the blade on that side. Take the socket on about a 14-18" breakover, turn till things bind and stop, then tap the breakover handle with a hammer to break loose the bolt or nut. Go to the other side and do the same. That's why the pipe is 4 ft. long.
Always wear gloves when putting the sharp blades back on, if u slip off the bolt, big cuts can accure.

good luck out there

ballping