Hey bro, John is saying that the black plastic 'undertray' that comes with the Tyga kit is serving only to keep heat inside the fairing which is adding to your problem. If you chuck it in the bin then air will flow through the tail fairing better and help to cool your reg/rec.
So he's recommending that you make up a more effective heat sink to mount your reg/rec to AND get rid of the undertray to improve cooling airflow.
Never buy parts from inside NZ mate. Not unless you enjoy a good raping anyway. Unless they're from econhonda in Te Aroha:
http://www.econohonda.co.nz/
I think i got my spare reg/rec from Tyga as part of a larger shipment of bits and pieces - as John says: the part is common to many Hondas and the one i have now has cooling fins cast into its body as an added bonus. Even if you buy just the reg/rec from over seas then add shipping and gst you'll still save yourself a fortune on what the NZ wholesaler will charge you. Because they are dirty, get rich quick c**ts.
As for what's causing the blow outs i can't help there mate, sorry.
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After years of moaning about immigrants now i am one...