So I bought these two yamaha gp 800s yesterday for 400 bucks with a double trailer. The guy that I bought them from said he got them from a buddy back in 2013 and he just said they didnt run. I figured what the heck the trailer is worth the 400 to me. The skis are a 1998 and a 2001. Does anyone know what I should look into first for as to why it's not running? I have some mechanical abilities but not crazy knowledge. Any help would be appreciated guys and girls.