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Jaz -

It does sound like a fuel problem. Have you tried pumping the fuel bulb while underway and if so does that make the problem disappear? If it does then it suggests a fuel pump problem.

I would first check the compression on all cylinders. You can purchase an inexpensive compression tester on Amazon. Also, purchase a service manual as it will provide you with critical details needed to self service your engine.

Next remove the carbs, disassemble them, clean with carburetor cleaner, and then ultrasonically clean them. Reassemble them using a carburetor rebuild kit. I would also do the same for the fuel pump.

While you have the carbs off remove the intake manifold and inspect the reed valves to make sure there is not a problem there. Here is a link that will give you an idea of what to expect: http://www.whalercentral.com/userphot...lbum_id=65