Problems-yamaha xt 225: excessive smoke emission

Hello. I have a problem with the excessive emission of smoke when it starts cold on my motorcycle. It is a Yamaha XT 225 model 2006, Made in Brazil. In Argentina, the motorcycle "smokes" a lot when I start it in cold, then, when the engine heats, quit smoking. What should it be? I intuit that it will be a problem of hoops, but I ask for advice to this expert forum. Greetings and thanks