A work of caution:
The two stroke Detroits have, on occasion, been known to have a blower seal fail after sitting for some time. If this occurs when you start it up oil from the blower finds its way into the intake. This results in a runaway engine and can result in SERIOUS damage to you and the engine.
Don't let that discourage you, just be prepared. Make sure that there is a manual kill mechanism in place and functional. Generally a "flapper" on the intake that when engaged shuts off the air to the engine.
If it does not , a CO2 fire extinguisher (MUST be CO2!) discharged into the intake will do the trick.
This is not terribly common but it does happen. It is best to be prepared.
The gent in the video has a 4-53 and stops it with a rag stuffed in the intake. I have been next to an 8v71 that ran away. I would not want to get that close... Nor would I want to chance anything getting sucked into the engine.
I love the two stroke Detroits. They are unique animals.