Re: Water Getting in Top Cylinder Yamaha 40hp Twin

[joesnuffy]

Your right I have been driving myself crazy looking for a water leak. I am not convinced it is either. I did not see water droplets on the piston nor cylinder head when I removed it. I was also thinking that excess fuel might clean the head off. This is when the problem started. I was putting sound reduction material inside the cover because it had none. Where the hole for the air is in cover to be sucked through to run engine I thought I would make the opening like a 1 inch square hole and make it bigger if need be to eliminate unwanted noise it should have been like a 1.5 inch by like 3 inch hole. When I placed the cover on the motor is and tried to start it is when the problem occurred. Do you think I might have bent a reed valve/s or caused a leak between the case halves? I also read that a bad fuel pump can push fuel into the engine? I have had an engine in the past that did have a head leak and it would run out of water right not in water as you mentioned. I have the boat on water right now it may be time for me to trailer it to confirm or eliminate the water issue. Thank you for your help.

Joe

ps your right the top cylinder is the one not firing correctly. Looks like it has been cleaned.

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