Top End Removal Help

[bonceunounce]

Sorry to be a pain

Im currently stripping down my top end to rebuild it.

I have this 'thing' attached to the right hand side of my barrel, has RC Valve written on the outside casing.

I cant see how it comes off, it has two allen bolts in it, i got one of them out, the other is tucked right behind the frame.

Any ideas on how it comes off/out

[bonceunounce]

No ideas anyone?

I took the cover off the front, and there is a gold circular thing on, with 2 cables going into it, i unhooked the two cables, there is a 10mm bolt in the middle of this gold thing.

How does the top end come off exactly, its a NSR RK 125cc , 1990.

I have removed, 6 10mm nuts from the cylinder head and the cylinder head came off, leaving the barrel with the piston in the middle.

There is 4 , 12mm nuts around the base of the barrel, ive managed to undo three of the four, but on of them is under this powervalve thingy and i can get a spanner under there to do it but i cant see how the nut can come away once its been undone?

You cant take the hole powervalve off, only the casing and the 2 cable from it, so the manifold for it is part of the barrel , and this 12mm nut is under this manifold, so how do i get the barrel off?

Unless when i took the 6 , 10mm nuts off the cylinder head , if i tap the barrel with a soft hammer will it come free?

Im totally lost to how you actually remove the top end, if anyone could give me instructions id much appreciate it.

Thanks