Thanks fontyyy, that is very helpful.

The reason I say it is an SP chassis is that it has the Magtek wheels and the fork adjusters are unmistakable. Gold front discs are also SP specific if I remember correctly.

The flywheel should be a dead giveaway and could be a contributor to my power output.
My pipes are also most certainly not the stock units, might well be 21 pipes, they are super light and not restricted in any way. My pipes are also retained with springs not bolted on as per the picture you posted.

I am running open carbs too.
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If you want a proper 2 stroke get an RGV.