Unit: Seapro 305 190HP Mercruiser I/O 2BBL Carb<br />Hours on Engine: 544<br />Ignition is: Thunderbolt<br /><br />Runs fine up to 4000 to 4200 but go over that rpm and engine begins sounding off mulitple popping sounds thru the carb.... eventually ending up with an occasional loud backfire.<br /><br />After the backfire explodes, the popping begins again and if pushed long enough another backfire will occur.<br /><br />After jumping ship 6 times and swimming back to the boat I decided maybe I better find out what the heck this was... my arms were getting tired.<br /><br />So far...<br />Timing has been checked and on the money at 8 degrees BTDC<br /><br />Replaced the following items..<br />Sensor in distributor<br />Coil, Wires, Plugs, Cap and Rotor.<br />Coil was leaking oil so started with that first.<br /><br />Known problems:<br />Water in fuel..<br /><br />Tank was less than 1/4 tank and had water in it when I purchased the bought 2 weeks ago, so I dumped 3 cans of water evaporator in it and filled up the tank with high octane fuel.<br /><br />Tried to grab some jet fuel at the airport but the cops made me disconnect the syphon hose and tow my boat out from under the airplane. 
<br /><br />Anyone have any ideas on my problem?<br />PLEASE EMAIL ME TO LET ME KNOW YOU POSTED A MESSAGE TO DO WITH THIS PROBLEM OK.<br />customerservice@401hosting.com<br /><br />Thanks to all who reply.<br />CaptainHook - Rhode Island
<br /><br />Anyone have any ideas on my problem?<br />PLEASE EMAIL ME TO LET ME KNOW YOU POSTED A MESSAGE TO DO WITH THIS PROBLEM OK.<br />customerservice@401hosting.com<br /><br />Thanks to all who reply.<br />CaptainHook - Rhode Island