2000 XP and GT Troubleshooting HELP!

[Sarah.Katherine.ATX]

Hello,
My parents recently gave me their old seadoos. One is a 2000 XP and one is a 2000 GT. The XP has been sitting in a garage for a few years and the GT was running last summer. I have changed the batteries and spark plugs. They both sound like they're trying to start but they just won't turn over. Before I take them in, I was wandering if there was anything else I should try?

Someone mentioned because of the old gas and gunk thats been sitting for a while, theres some kind of fluid I can put in the tank and run it through the system and it will clean it?

Just looking for ideas on what I can check or clean before I take them in.

Thanks so much.
Sarah - ATX

 

[Bills86e]

No its done old fashioned way, siphon out, rag on wire, air chuck lines or replace if grey tempo, clean or replace selector, clean separator filter. Go thru carbs. THEN
have a Happy Summer.