I eat my R6
Join Date: Dec 2014
Location: Southwest Ohio
Bike: 2008 Yamaha YZF-R6s Stock
Re: Why are there holes drilled in engine block?
Mine has them. Contrary to assumptions, these aluminum alloys do degrade, but it shows as white powdery splotches; and that's what we're seeing in the photos.
The side he photographed is flat, but the other side is flared, like these.
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It opens up to the area beneath the seat, so the amount of corrosion is minimal; looks clean as opposed to the other side. It may be that corrosion that gives the OP's photograph the rough "drilled" look. Based on the other side I doubt they're machined; though it's still perfectly possible.
Maybe they stuck wires through these holes for hanging them up while dipping them or something?