Turbino, you have posted this question under the SCTA Rules Question section, when it should have been asked in the BMST section,, there are folks on here that only refer to SCTA and not BMST,,
After doing a little resurch I tend to agree with you,, if you check out the AMA records (which normally go hand in hand with BMST) you will notice that all the BudFab records from 2006 thru 2009 across 50cc, 100cc and 125cc are all listed as naturally aspirated