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Originally Posted by cRiPpLe_rOoStEr
I didn't refer to the need for scavenging, I refer to it being more comfortable at a narrower RPM range. When it comes to VVT on motorcycles, IIRC there are some Honda models featuring it, including the JDM 4-cyl CB 400.
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It's still a 4 stroke, so the main issue is heat conduction losses as it breathes pretty efficiently; it's pretty happy >3000rpm. You can mess with the intake side to get a slightly wider powerband, but at least it's not like a 2 stroke where volumetric efficiency takes a nosedive outside a narrow range.