Part 1: Stihl 064 to 066BB Conversion- Drilling and Tapping Crankcase

This video explains a bit about installing an aftermarket Stihl 066 Big Bore top end made from Bailey's, onto a 064 bottom end. This is Part 1 and it covers drilling and tapping the crankcase to fit the M6 x 25 spline screws that are OEM for an 066.
I could not find any video tutorials explaining this somewhat common upgrade for the less expensive Stihl 064 (85cc) conversion to a 066 BB ( 99cc).
The video is pretty long, and it's meant to be because I have some informative commentary along the way and I want to show the entire process highlighting potential hiccups you may encounter etc.

Видео Part 1: Stihl 064 to 066BB Conversion- Drilling and Tapping Crankcase канала Kevin Saavedra