Re: Kasea review, day one...
You can tell very easily. If you remove the airbox and look down the carb throat, extend the throttle. You'll see the slide come up and fully open. If the brass sleeve was there, you'd see it clearly above the silver colored slide. Take it easy with her. The most important thing she can learn is braking. If tire traction becomes an issue with the stock knobbies, go to Walmart and pick up a set of Carlisle SnowHogs. They are 18x6.5-8 in size. All the racers use these tires on the Kasea 90. I have smaller ones on my son's mini SkyHawk 50 and they rip! They are a hair shorter in diameter than your stock 19's. This will give more torque and acceleration (good for climbing and takin off), but will reduce top speed a little (maybe 2-3 mph). If it can hit 40mph with that restrictor removed like Master Wrench said, or even if it was 35, the 2-3 loss wouldn't even matter. She's just learning now anyways. You can always make it faster in the future for very little money. While you're at Walmart, get a few extra NGK B7HS plugs. Like Master said, get GOOD, two-stroke synthetic injector oil. Don't buy pre-mix oil.
Enjoy riding and keep it safe!