Alright man I'm on my 2nd bike it can be a pain with cheap quality stuff but you can find ways around it and alternatives. 2 stroke kits are usually pretty simple for a novice motorized bike builder but a better spark plug (NGK), carb and better chain help alot as well as investing in a cnc aluminum sprocket instead of the junk kit one also breaking in the engine right with good oil. My neighbor has a bike with an engine from 2016 that has over 1200 miles (not sure how many km). Anyways good luck and be sure to ask for help if you need it.