Hi guys, treated myself to a vx110 a couple of weeks back. I let a friend use it and he sucked up some stones in shallow water even though I told him don't run it in shallows! He damaged the impeller so I had it replaced with a skat trak impeller. Not sure of what pitch but I will find out Monday. The guy at the shop I bought it from told me it would improve acceleration and top speed. Went out on it yesterday for the first time since its back together and it pulls well but it now only does 48/49 and before it sucked stones up it was doing 54! I noticed that 3/4 throttle onwards makes no difference other than noise!

Has anyone got any ideas what could be causing this? Help would really be appreciated

thanks, Matt