Sluggish acceleration above 5000 RPM

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Yikes! I was asleep for that one.... Seconds vs. min.... Geez. 

And (correct me if I'm wrong) only half that if you are only including combustions in a four-stroke with two cylinders(?)

(You know, I recall a moment of hesitation while adding a comment on physics or engineering to one of your posts....)

Well, I had to Google proximal.  So, don't feel too bad.  

Of course, in Grumpy's video, I swear I heard him say the engine was downstream of the driveshaft.........