Hi John, Those little Johnsons are great motors. The impeller is pretty aasy to change. Just drop the lower unit gearcase and there it is. Try not to pull up on the drive shaft or you will pull it out of the pinion gear that's inside of the gearcase. That can tricky getting it back in. When you remove the pump housing, inspect the inside for any grooves and excessive wear from sand, grit, etc. If it does, you will have to replace the housing as well as the impeller. You can get a manual from www.laingsoutboards.com Most parts like coils, points, carb kits, and seals are available from your local Johnson dealer.