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At first I thought it was a hit miss, but I believe by the sound it is a diesel. Notice how he got it spinning before closing the compression relief to start it?
 

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Termites would love it! Impressive craftsmanship, only fitting it has as unique an engine as its frame.
 

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At first I thought it was a hit miss, but I believe by the sound it is a diesel. Notice how he got it spinning before closing the compression relief to start it?

That's exactly the way I used to start my gasoline make and break engine, and it is how the centrifugal governor worked too. The centrifugal weights moved a rod that held open the exhaust so that the piston couldn't suck in air fuel mix. When RPM dropped enough, it would release the rocker allowing the valve to work as normal and the piston fired.
There was no cam or rod or rocker for the intake valve. It had a very light spring and as the piston went down the suction opened the valve to admit fuel air mix.
 
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