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Thanks, guys, I'll take a look.

Yes, I mean the transmission oil. If the crank seals, which are new, are shot is there a second event other than black transmission oil that I can reference? It would be nice to triangulate.

The engine is a KTM 200, 2-stroke. After putting in new main bearings, seals, rod, piston, rings, and cylinder coating, the oil comes out black after only a two hour ride. The change in used oil color is new since the rebuild. The cylinder was sent out, with the new piston, to a reputable...