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2009 / VZR1800
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IMHO those are just surface web like marks happening to many casts
when cooling after the molten metal was poured in the form...
Try to surface grind deeper and you will see it doesnt go deeper,
that is what I think...
 

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2007 Candy Sonoma Red
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I agree with the above, it's just casting flash. Notice none of the machined areas show any sort of cracking. When you melt aluminum it gets a film on top, and the film is what shrinks and looks like cracking.
 

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Discussion Starter · #5 ·
Thank you guys, now I can sleep nights better. It just looked more than casting marks to me first.
 
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