In the evening, I bought a used replacement engine for my Honda Bali 50, which became unusable the other one. The engine is fixed, the seller said, I bought it for a narrow thaler. The condition of the engine was desolate, at least I split the engine with trouble (because of the condition), new crankshaft etc. are ready, but the black spots or the oxidation make me still headache. With pictures. I cleaned it for hours, sanded it, currently it looks so S. Could the engine be installed like this, or should the black snot be completely removed? What is the best way to do that? Various attachments for the Dremel are used, but not everywhere you get in well, I don’t want to clean the Lsger seats too much.