Interesting to see this old thread pop up. Can't answer your question.
I have run this engine back when-very strong but needs bearings, just haven't got aroung to taking it apart-Maybe I'll go for it this week. If I remember I couldn't get the bearings off even with heat. I'll try again.

PS-took the engine apart at lunch-Yep! still needs bearing-hope to find them cheap and seals too! This engine is on the heavy side but really runs nice from what I remember. Worthy of something anyway.