That was fun to watch....Gotta love that British wit!
On a side note, I have successfully built MB's with high powered front engine drivetrains capable of 53 mph without crashing (see avatar pic)
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53mph with a Cag stage II pocket bike engine @ 4.5 hp, geared 15.6:1 V-Belt drive using a tach @ 11,000 rpm's. I've since retired 3 of these Cags...They are strong as heck, loud, w/ hi compression, but dont live long.
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The choke is the flap or slide that restricts the amount of air getting in, so it makes the mixture the engine breathes much richer. We don't know the french for it either.
An old time English word for it was the strangler. And given the nature of old British 2 strokes, entirely suitable.
I remember seeing one of these in Holland before, nice piece of kit That lad in the Video just hates the French I'd say. No problems watching the vid on Linux either