Old 08-31-17, 10:38 PM
  #11  
Jseis 
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Join Date: May 2012
Location: SW Washington state on the ocean!
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Bikes: 1973 Motobecane Grand Jubilee, 1981 Centurion Super LeMans, 2010 Gary Fisher Wahoo, 2003 Colnago Dream Lux, 2014 Giant Defy 1, 2015 Framed Bikes Minnesota 3.0, several older family Treks

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My Kawasaki 175 Bushwhacker had a rotary valve, Husqvarna chainsaw has reed valves, and the .049 model airplane engines had the piston as the slide valve. All hi-rev two strokes. Solenoid operated poppet valves seem like a natural evolution assuming the durability can be worked out. That being said, powering yourself down the road with micro explosions seems quaint.
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