Marc, do yourself a favor and start with the basics.
Check for spark. Even though you changed the coils 7 years ago doesn’t mean the points can’t get dirty or the condensers go bad. Get an open gap spark checker and check top and bottom cylinder. Should get a good consistent sharp blue spark that jumps 1/4 inch gap. Once you rule out ignition, then move on to fuel delivery.
Fuel delivery:
Do you have a pressure tank fuel delivery system or a fuel pump?
fuel pump
– usually a fuel pump does not go bad in few years. If it is an aftermarket fuel pump then reliability maybe questionable.
– check the fuel pump for cracks in the cover that sits over the screen. It could allow air to be pulled in and affect delivery.
– make sure the fuel tank vent is open or the valve is patent. A closed fuel tank system that does not allow air to enter the tank will create negative pressure in the tank and prevent the fuel pump from pulling enough fuel from the tank to push to the carburetor. Thus requiring the choke to be maintained for fuel delivery.
– check your fuel line and connections to the motor and tank, the whole length.
– make sure the fuel hose is oriented in the right direction. I think the bulb has anti-reflux valve.
– fuel tank’s pick up line screen is partially clogged with trash/clumped oil.
– water accumulation in your fuel.
Pressure Tank:
– Your tank’s pressure maybe be leaking due to a leak in the tanks gasket.
– Poor o-ring sealing
– Tank’s pressure relief valve is faulty or dirty.
– Check your dual line fuel hose to see if the there is cracks or damage on the air side from the exhaust manifold nipple.
– fuel tank’s pick up line screen is partially clogged with trash/clumped oil.
– water accumulation in your fuel.
OR
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You just need to take the darn carburetor off and clean it!!! Put new high and low needle packing. If you have an old cork float, see if it is still buoyant.
I know a lot of people spray carburetor cleaner in all holes the carburetor while it is attached to power head, but carburetor cleaner can damage gaskets and plastic. Turns them soft. So, it is better to take the carburetor off and disassemble it and clean it with carburetor cleaner when all the gaskets, packing and high boss gasket are off of it.
These are just a few thoughts, that may help you out.
Cheers, I hope you get it resolved soon and back on the water.
Cajuncook1
