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Yamaha 4 stroke 75 - Making buzzing noise when trying to start

Kenny Light

New member
I haven't used my boat in about a year. I just replaced the battery because the flywheel was't even turning. As soon as I connected the battery the bulge pump turned on and a bunch of water came out of the hull. But it won't start. when I turn the key a buzzing noise comes on, the flywheel turns but it just won't start. Does anyone know what the problem could be?
 
Does the buzzing sound come on at key on or start? If it is key on it is probably the fuel pump in the VST, if it is fuel injected. That is normal. Why it won't start is another matter. Does it crank over at around 200 rpm or slower? The cranking speed may be too slow. It could also be compression, fuel, timing and etc. Need more info to help.
 
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