This is critical as it holds the bike together and of course you don’t want to see any breaks in it.
If there has been any welding carried out, ask the seller why? and if it was normal wear and tear or has the bike been badly abused?
Many mini-bike frames come in all kinds of designs based on the bike and what it’s built to do.
Manufacturers make them out of all types of materials so you may require a light weight aluminium frame or a sturdy steel frame, this again depends on the amount of punishment or speed you require from your moto-bike frames.
Guy and his minibike frame.
Mini dirt bike
Your bike dirt mini needs to be sturdy, whether you have a bike dirt electric minimoto or a petrol bike. A dirt bikes mini moto has many options so do research on what you'll be doing, racing ? jumping ? etc....The mini dirt bike is so cheap its great for anyone, but buy the right one from the start.