Its a very easy thing to do.
1) Remove rideplate (4 bolts)
2) remove Intake Grate (3 bolts) and while your at it, replace this STOCK POS grate. Even a cheesy Westcoast deep grate is fine.
3) Remove nozzle (4 bolts)
4) Remove 4 allenhead bolts holding pump on. (You will need an allenhead socket and socket extender to get to them).
5) Disconnect the waterlines from the pump.
6) Pull pump off the hull. This is kind of a PIA because sometimes the silicone puts up a good fight. ****DISCLAIMER. Grip the driveshaft and keep pressure toward the motor while doing this. This will prevent the driveshaft from disconnecting from the motor. If this happens, the coupler dampener may have fallen off.... and will need to be reinstalled (which normally means the exhaust has to come off unles you are flexible like gumby).
7) Now take the pump to your workbench. Remove the tail cone (2 bolts).
8) Put exposed pump shaft into vise. You will now need the PROP REMOVAL TOOL (Part # 62-2029) $13.
http://www.atlanticjetsports.com/tools__pump_tools.htm
Install the REMOVAL tool into the IMPELLER. And turn the IMPELLER tool with a socket. (Sometimes the impeller can be a BITCH, and you will need a cheater bar or a impact).
9) Reinstall new impeller the same way. Grease the PUMPSHAFT threads before installing the new prop. Torque it on tight. THEN REINSTALL THE CONE.
10) THIS IS OPTIONAL. But remove the water fitting from the pump and drill it out to 1/4" or so. This will give the cooling system much more flow.
11) Clean old silicone off the hull with wire brush, die grinder with wire brush works awesome for this.
12) *** BEFORE DOING THIS MAKE SURE THE DRIVESHAFT IS STILL ATTACHED TO THE MOTOR BY TRYING TO TURN IT BY HAND. If it spins freely you much check the couplers and damper.
Silicone the area the pump meets up to the hull with QUALITY SILICONE. Permatex RTV is really good. There are others... This is the most important part to get good coverage. Any gaps will result in AIR entering the pump and MASSIVE cavitation.
12a) Reinstall pump onto the hull where you have siliconed. Smooth over the silicone with your finger to remove globs. (WEAR GLOVES).
13) Reconnect waterlines.
14) Reinstall nozzle, intake grate, and rideplate.
15) Let silicone cure for 24hours if you use permatex RTV.
16) RIDE and enjoy not having stock PEICE OF




IMPELLER. Your boat will feel like a completely different boat. Biggest improvement to a basic X2 setup you can do.