First and for most.......
NEVER use "Starting Fluid" to fire a 2 smoker.
Having raced motorcycles for decades, and spinning wrenches on them, I can tell you it's a no-no.
Gas/oil mix goes into the carbs and is drawn into the crank area of the motor through reed valves.
The piston travels down creating positive psi in crank area.
This pushes fuel/oil mix through windows in the cylinder wall to the compression area, (top of the piston).
That fuel oil mix ALSO lubes the crank, rod, piston pin. (Hence WHY you mix oil and gas)
"Starting Fluid" will wash the oil off a bearing or wrist pin and then you got metal and metal............
If you have to use "Starting Fluid" it MAY be a sign you have low compression, the reeds are worn and not sealing.
IF the motor has been sitting for a long time, the needle valve, (think shut off in a toilet, float drops, needle goes off seat, lets gas in. Bowl fills, pushed needle into seat and shut off fuel feed).
This maybe stuck up and closed, not letting gas/oil in or the jets my need to be cleaned, (gas evaporates and leaves the oil sticky stuff in there, or a white powder from the E in Ethonal gas).
Unless I KNOW the P.O. and KNOW he can do the RIGHT repairs, I NEVER trust ANYTHING they do!!
There is a lot of butchers out there!!!
If the pump is suppling fuel to the carb, it's inside the carbs.
Do the simple cleaning first..... remove the fuel line at the carb.
Spray carb cleaner in the tube going into the carb, maybe it'll free the needle, and get enough in there to clean the jets.
Sometimes it works, something naaaa.
I use "Sea Foam" in my fuel all the time to keep my carb clean.
What I would do?
toss the electric pump, either go back to VRO, (I have a 91 'Rude and my pump is still nice)
or get the older pump and plumb it in, not hard, Lots of info here to do it.
Or take the carbs off and do it right!
Joe
Always take any advice I give with a can of beer er 2!