Was given a GCV160 (vintage 2011) off a Husqvarna mower to fix. Starts good, sounds good and has good compression. But it smokes moderately & consistently. I suspect rings. When I cracked the case and inspected more closely, I noticed quite a few vein-like cracks on the outside and inside of the the case itself. I have included a shot of the outside; inside looks similar. Could just be cosmetic & superficial, and as I said, it runs fine. Anyone have a Honda engine like this with these cracks? Is this a sign of impending crankcase demise?