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The squeal sounds like fuel being pumped through a constriction. It stops when the pressure equalises.
My bet is on a kinked fuel hose, although I've always wondered how that can happen, being as stiff as it is, but it has happened on several bikes.
 

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What is the fuel pressure test setup like?
If you have a quick disconnect in your line, it's easy to make. All you need is an air pressure gauge that goes to about 60 psi, another quick disconnect pair, some suitable fuel hose, a Tee piece and a length of hose from that to the gauge. You need some distance to the gauge if it is not compatible with fuel. It also makes it convenient to hang up.
Audio equipment Gadget Cable Jewellery Gas

This line doubles as a means to move the tank further from the throttle bodies, giving you more space to work when synchronising them.
 

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Is that a new spelling of F----d or an Oz variation.
Actually, if truth be told, Cactus, is short for "Cactus Fuctus", possibly being a reference to the prickly pear cactus that was introduced in 1788 by the First Fleet, which quickly took over the joint and was eventually eliminated by introducing a caterpillar/moth 130 years later. The Cane Toad introduction wasn't quite so spectacularly successful.
 

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The problem is if you run the stepper while connected to the bike but out of its housing, it winds the piston out, but only winds it back a tiny amount.
Another way of making it wind back in is to make up a cable that swaps the connections to ONE of the stepper coils. With that in place, when you turn the ignition on the ECU will "think" its winding the piston in, but it will actually be moving it in the opposite direction.
 

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let me get this straight, ith stepper all reassembled and connected , at rest key off all off the piston should rest at the top of it's stroke.If you turn ign on and run button (but not hit the starter) the piston should recoil a little to let through some air ? when you turn off it will go back to rest at the top of it's stroke
Here's a video of what should happen when the ignition is turned ON & then OFF - for the Tornado:
  • OFF: the piston should rest partially open
  • ON: the piston moves further to the initial idle position
  • OFF: the piston fully closes, and the ECU makes sure it IS fully closed by over stepping (you can hear the clicks), then it moves back to the partially open rest position.
 

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Did you ever check the fuel pressure?
Pretty basic & simple to do - if there is no pressure, or below 3 Bar, it won't run.
 
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