I have a 2013 GTR 215 with 18 hours on it. I bought it new last summer and it ran great. I put it away for the winter. I brought it out yesterday and it seems to have an acceleration problem out of the hole. Once it planes out and the RPM's are up it works fine.
Look up thur your grate. I bet your impeller leading edge is damaged. I just fix the one on my RXT. It would run fine cruising, but the engine would rem up and no push. Nothing out of the hole. Your wear ring can be a little worn.