Welcome to Quadcrazy. I would pull the plug @viper0906 and spray some wd-40 or some penetration oil inside the cylinder head and let it sit for a day or so then warm the head up with a heat gun and try to spin the engine with the plug out. Hopefully the head frees up and it’s not seized. Also @Squirrel keep in mind that the cylinder head on the top right side has a compression relief lever that should be used when pull starting. Press the lever down and it should stay until you pull the engine cord. It will automatically reset it self so be sure to push it again before pulling the cord or your shoulder will be sorry!

So I traded my worked banshee for a supposed to be kfx400 with a 440 kit and hot cams with yoshimura pipe. Well I overlooked it now and came to the conclusion that it's a stock quad with a pipe. How do I know you ask? The cylinder jug has 2 bars on it and every other has 3 for the big bore. He only jetted the carb not buy the new one that's supposed to be bigger. The cams are stock. After pulling the cover off. And it's slower than the banshee. Now that's why I won't believe anything this kid says. Sh**. He doesn't even know how to mix oil to gas. Has no clue how 2 strokes even work. Can't figure out how to jet for temp changes. But I guess I'll be happy with what I have. The point is. Don't trust people when buying bikes. Sent from my SM-N920V using Tapatalk