Diffrent 4 stroke

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The reading states about 1979, where has it gone since then as the really good idea it seems to be.
Now I'm wondering why I haven't read or seen anything like this before.
Thanks for the post.
 
How ya gonna lubricate the upper pistons? With the porting they are working like a 2 stroke. Thinking they will need oil injection or premix to keep this motor running for long. No way this can be made as light and simple as a DOHC engine where the cam lobes directly open the valves (with shims to set clearance, of course..).
 
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