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If you want to do a more through job, I'd take the whole carb off and spray non residue cleaner through the nipple where the fuel line attaches to- this will clear the needles as well as clearing any other debris that could be in the way- although either way is fine. If you want to save yourself...

The actual part that keeps the compression is the head button, this is a separate part to the cooling head. The rotation of neither should make a difference, as long as all holes line up and you've tightened the screws sufficiently, and roughly equally. Flushing out the lines with wd-40 is a bad...

The shims are under pressure when mounted, so that shouldn't be the issue. Did you re-install the cooling head properly? Also, why did you spray WD-40 in the fuel lines? And also, the help is fine, it's what we're here for. :)

How were you getting WD-40 in the fuel lines? I wouldn't use that as anything but a light oil as it dries as a gummy residue. AsKris407 said, make sure you haven't lost the shims and try putting some fuel directly into the glow plug hole. :)

Even white hot towards the top I'd say.

True, but in this case the engine is only 3 months old, and, unless dirt got in the engine, it would not be worn out. He also mentioned that it was still stiff to turn over, showing that there is still compression, meaning that the engine hasn't been worn out.

When you say "pull of the head" do you mean take out the glow plug? Did you break in the engine too, as per the instruction manual? First I'd check whether fuel is getting into the carburetor, if so, re-check the glow plug- take it out and put it on the glow igniter, it should glow bright red...