Amen, I've tried to say that for years, I have several AB? type engines that never had a pinch, they have lasted as long as the ones that did. I even had people tell me that converting AB? engines to Diesel would destroy them because they run too cool, not true. My three highest time two strokes, an old Webra .91 ABN, Fox .74 ABC and an Irvine .53 AB?, all converted to Diesel, the only one that had a pinch at the top is the Webra and it still does. A few folks have fussed about OS not having the correct instructions for AB? engines, they needn't bother because it doesn't matter.