I've recently repowered my 23 sloop with a used 9.9 Yamaha outboardengine. Starts great, revs good in neutral,. But when under a load in gear it doesn't want to rev up. Gas comes out of the carb air intake. .???
Have you got a dink that will handle an engine that size? If so, put the engine on the dink and see if the same thing happens. If yes, you've got a carburetor problem. If no, you've got a prop problem.
__________________ cruising is entirely about showing up--in boat shoes.
Your Check Valve is blocked which is making your float stick which in turn is flooding your carb .Thats why gas is coming out . You need to take off your carbi and clean it . Get yourself a can of carbi spray. Yamahas have a realey good reputation as long as you use em .Leave them un used and they are a pain in the ass .