Vertex/S3 are stock pistons.
If it's not an alignment issue between the engine and frame then it has to be internal.
Easy enough to check the flywheel for play at a first. If you really want a smooth engine then a full rebuild, well trued crank, and some accurate measuring of tolerances through the engine is the best way forward..
I still don't like that GG is persisting with these sealed main bearings; although I haven't heard of many failures in regard to them. I just don't like it in theory.
I haven't had my rhs engine cover off yet so not sure what kind of counter weight setup the newer engines run vs the old.
The cranks have changed, so perhaps some are coming out closer to tolerance than others.
I only have 8 hrs on my 250, and I don't feel it vibed any worse than my last couple. Maybe a bit more through the pegs; but I just changed boots last ride too.
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