I just bought a peace sports 50cc off my buddy, who’s had it for a few years, I’ve had it now for a month and it has run perfect. It needs a new battery but I’ve been kick starting it since I got it. Yesterday I was going down a hill and got up to 40mph and the engine started whining and it started to de accelerate and eventually slowed to a stop. I kicked it over and then it started up just fine after. Today (the next day) I kicked it over and it started, I drove about half a mile and it did the same thing except when I hit 30mph, it slowed to a stop then shut off. I went to kick it over and it wouldn’t kick at all. It rolls but won’t kick. I tried jumping it, and when I do so it try’s to turn over but won’t. Could this be a sieze or what? Please help!