I am new hear I had a boat probably 25 years ago but been going to the river the last 10 years with my family was finally able to get a boat ended up getting 89 commander jet boat one owner paperwork in hand he took it to get seviced before I picked it up  but took it out and with in 30 minutes I was broke going down the river about 25-30 miles then slowed down to a stop put in nutural put back into gear and nothing got it in checked areas nothing was clogged and took clean out of was able to turn shaft by hand looked in nozzle nothing turned popped of inspection looks like the u joint broke need some knowledge from people that know