My John Deere TRS21 is a great little two-stroke machine, but occasionally I have trouble getting it to start. I have pulled my arm off, tried all different choke settings, and pushed the primer anywhere from 0 to 80,000 times, all to no avail.
The problem with all two-stroke engines is their remarkable ability to foul spark plugs. More than once I have had to pull the plug on my snowthrower's engine and clean the carbon off the end. Because of the oil mixed in with the gas, I often find myself having to clean the plug due to too much gunk being deposited on it. After a good cleaning, it starts right up.
Good luck with your machine. Those four-strokes do look nice, especially with a driveway as long as mine!
B-52s don't take off. They scare the ground away.