You know, funny thing adding to the 110 I mention.. it started when I noticed the valve cover gasket would go first. I surfaced the cover (like most YS engines really need) and solved that. But, then all the sudden after the valve cover was seated really well, the other gaskets started blowing out. First the backplate, then to another one I forget now.. I think around the carb area. been long enough now, I dont remember certain. I rebuilt it with new gaskets twice, but same thing both times, backplate gasket then the next. All within about 5 tanks. One side of the gasket would be nearly eaten away completely.

Pretty certain I surfaced those areas as well as I could too while i had it apart, thinking the same thing. It ran SO well though, for those few tanks it was amazing.. but just wouldnt hold. even transition was a bit more crisp than most I have had.
I do intend on playing with it again sometime near future when I have time to kill.. just wish I could find some high quality gaskets... because cutting them out is a serious challenge!