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Fuel and oil leaking from lower unit,Spark plugs black and wet.Motor starts on first couple cranks,then begins to run rough,then dies. On restart Motor will not start unless throttle advanced,drop back to idle and it dies. Motor recently rebuilt.2002 90 hp yamaha.please advise.Also what is the unit mounted to carb #2 with the closed/open red lever.
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not enough info
maybe bad fuel pump, but that would not effect all cylinder plugs -
Maybe you have a carb leaking/overflowing...remove cowling and look around for some fuel leaking...Comment
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Two stroke? if so, the red lever is an emergency starter valve that provides excess fuel when you're in trouble. If you can't run it in the normal position per the owner's manual, I suggest a complete thorough cleaning and carb rebuild. I suggest only buying the individual gaskets needed here, getting a service manual and keeping a cold six nearby. No special tools needed and should take less time and grief than schlepping to a marina. Carb cleaner and compressed air help. The middle carb on our '04 has an electrothermal valve that serves the same purpose as a choke.Originally posted by losinmoney View Post
The other stuff also suggests carb issues often caused by ethanol eating the fuel hose and related plumbing from the tank. If so, you'll be right back where you started if you don't replace all with material listed for ethanol resistance or low permeability.
2004 90TLRC Yamaha Outboard CARBURETOR Diagram and Parts
Owner's manual can be downloaded and service manual can be bought through Yamaha's site.
Good luck and keep us posted.Comment
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