1999 speedster sk

Hi All, I just was given a 1999 Speedster SK. It's it pretty good shape overall. Other that some cosmetic stuff and the seats are in bad shape. After a installing a new battery, 2 new trailer tires, and lighting she's good to go. I tried starting her up but 1 engine wont turn over and the weed...

Having issues with one engine seems to not have full power with take off. Can't pull up skier. Once boat levels off then ok. We have owned this from the start. Never have had any issues. It is almost like there are weeds in the impeller but everything checks out. Thanks for any help new to...