Hello<br /> <br />Can anyone help solve my problem please?<br />I have the following symptoms on a brand new 15hp Mercury 2002 model (built July '01).<br />Started second pull when cold on 25:1 break-in mixture and ran well at 2/3 to 3/4 varying<br />throttle for an hour or so without slowing down to idle speed.<br />When I finally stopped and idled for around 20 seconds and put into gear again and increased throttle it died at about 1/2 throttle setting as if it was choking or flooding.<br />Tried increasing the throttle slowly and then quickly but it made no difference, engine would just choke and die.<br />Ran along at 1/4 throttle (on 1 Cyl. I think) and after about 60 seconds or so it sprang to life and ran well again but as soon as I go back to idle for more than about 10 seconds the problem repeats all over again.<br />I have had many small outboards and run them in on 25:1 mixture with no problems and I cannot believe the plugs would foul in only 10 to 20 seconds of idling.<br />Also the problem only occurs once the engine has warmed up and has been under load for at least 10 mins.<br />Fuel is fresh 98 octane unleaded and oil is fresh Quicksilver so I do not see a problem there and the fuel tank vent is open all the way!<br />I am puzzled and disappointed with the new motor.<br />Any ideas would be most appreciated.<br /><br />Thanks QB 