I am going to be removing the Jet Pump, Impeller, and drive shaft to replace the boot, carbon ring, and stainless steel flange because of a water leak (how do I know whether the hull seal should be replaced as well?).

I see there is a Jet Pump rebuild kit for sale, and I was wondering if I should go ahead with a rebuild or how can I tell if I need to do one?

I recently bought it used and so far my only problems were carbs and that leak.

My top speed is about 40 mph with just me in the boat and my single 787 110hp Rotax. Is that about the optimum speed I should expect with only one engine? I know I am loosing a little with the shaft leak (air into jet stream).

I am planning on doing the wear ring regardless.

Thanks. Sean.