Jet Ski 750 SX impeller install question

I have a stock 1995 Kawasaki JS750 SX Jet Ski. It performs flawlessly and currently there is nothing wrong with this boat.
  I am toying with replacing the OEM impeller with an aftermarket Kawasaki performance impeller. I have purchased a service manual. Should I notice a performance improvement with an aftermarket Kawasaki Impeller? Given that I am more mechanically inclined then average, is this a impeller removal job I should be undertaking myself, or should I seek professional mechanic assistance? I heard that it could be quite difficult removing the oem impeller from the jet pump impeller shaft. If I do this impeller job myself, should I expect the need to replace any pump bearings, pump seals, ect?
Kevin

Kevin,
Changing your original impeller to an aftermarket Kawasaki performance prop will help, but you also should check the jet pump housing and make sure it is in good shape and not worn out.
   As for changing the jet ski impeller yourself, If you have more then average mechanical ability and think you can handle it, Then just do it ( but make sure you have impeller removal tool).. If you ride in fresh water it should be no problem to get impeller off shaft. If you ride in salt water sometime the salt water impellers are a little more difficult and You might have to add some heat to impeller. I would recommend changing your pump seals & bearings with a Jet pump rebuild kit since ski has been in use for many years. Follow your repair manual and You should be fine.
 Ski Maintenance Pro