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Hmmm, it’s been many years since my Lawnboy days at “the power shoppe”. I don’t remember having rough/smooth side reeds, but can honestly say I probably never disassembled a reed block on a lawnboy. Those air filters were so flimsy, crap did used to get in there and hold a reed valve open. I usually just slipped the crap out of the reeds without disassembling. So, I guess what I’m saying is that the reeds may have had a rough/smooth side, I just never knew about it.
But, I have never heard of rough/smooth sides on OMC outboard reeds, although there were some specific orientation procedures on some engines.
And yes, using the vacuum gage would be very helpful. But, the problem is that OMC never published any procedures or specs for vacuum gage usage.. So, using a vacuum gage could cause confusion… Most of the outboards don’t have a proper vacuum port anyway.