Just bought a pair of Tigershark 770 Jet Ski's that had been sitting in a Garage for a year and a half with fuel stabilizer in them. One of them runs great but the other jet ski will only stay running in the half choked position. It will idle with the choke in and run wide open but will bog out at any other speed so I just run at half choke. But I can't run it in choppy water at half choke for long because the choke works it's way back in so I have to keep pulling it back out. I've siphoned all the gas out and put new gas in. I've changed the fuel filter. These things helped a little but not much. Is there a fuel cleaner that anyone recommends that I can pour in the gas tank or do I just need to pull the carbs down and clean them?