i have another new arrow and a used novarossi.
The cooling head is no big deal.I have 2 novarossiheads that i was not using.
They fit wery good on the arrow button.So that solves that problem.

And i can put the wing a on my xb9 a little higher.
And since the rest of this broken arrow is ok it might be usable as a spearparts...

when it comes to the carburator...the needles are ok,they dont change position even if they feel loose.

I can blame everything that happend to my arrow on my self and driving style ore lack of driving style

But again i was beeting up the novarossis a hole lot more without any failure to the engine.

So i think it is a combination of driving style quality and bad luck.
There just might be a reason why most other race engines cost the dobble and tripple of this.