Originally Posted by ibcnya
So youre running a 80mm? Im confused....the chart says the #68 is .78mm, is this wrong?
Indeed that is not correct. Your thinking is not right. "Designation" does NOT mean Del Orto part #'s. It means industrial number drill sizes. The table is for general usage and really just tells you drill bit equivalents, NOT Del Orto jet #'s.
Mine is a Del Orto #65 which is .65mm. Your is a #68 which is .68mm. Stock is .70mm which is the same as Del Orto #70
This is NOT a bad thing. The thought is the these engines will run better (as you are seeing and feeling) by being slightly lean of stock. Good blind experiment!!