This is how I break in engines, my chainsaw, MB, car engines I build... whatever.
Start it up, if it's water cooled I let that circulate for a bit to make sure it doesn't have air.
Then drive it. Not high RPMs, that's bad for bearings when they're new.
WOT and high RPMs are different.
You want to wear the ring into the cyl wall as fast as possible to insure the best seal.
So run it up to about half RPM near WOT, then let off the gas and decelerate. On the 2-stroke give it a bit of gas on decel to oil the bearings. The point of decel. is to suck metal shavings from machining out of the engine. And to cool it. New engines heat up very quick.
I usually let engines go 50 - 100 miles before I run them up to redline, but WOT is acceptable pretty early on.
But this is a little 2-stroke. Accel up to about 15 MPH a few times, do it faster and faster each time. Let it cool for a bit. Fastest way to do that is to ride with the motor off. A brand new engine gets hot very fast, and needs time to cool. Then do a few pulls at WOT to 15 or 20mph. Go up some steep hills, etc. Then just ride it like normal, try to avoid really high RPMs for a while... Also DO NOT use synthetic oil for break in.