All my bikes are geared to cruise comfortably between 28-32 mph, WOT they all hit close to 40 one has gps' s 42mph but the other two are about 37mph WOT.
Biggest sprocket I run is a 36T, when I ride to my work its 32miles round trip and I run the bike at a consistant 30-32mph.
They wont all hold up to that and none will for a long time probably but all three of mine have between 800 & 2000miles on them, all BoyGoFast engines but they have pretty good amount of vibes past 34mph.
I agree with everyone here that has said find the comfort zone of the engine before the vi es get crazy and do most of your riding at that point or below, your engine will likely hold together longer that way.
Best wishes and keep the rubber side down.