Yep
The engine is part of the frame structure. So, if you remove the bolts and lean a bit on the bike the whole thing sags a bit. You´ll notice that when you lift the engine a bit, suddenly the holes align. Insert bolts and proceed as planned...
With the bolts removed, all stress is on the spine of the frame, the large tube over the engine. Step back, look, and you´ll see what I mean.
Auke
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