Welcome to the forum. As you have probably noticed if you have looked around the forum it is predominantly in English, largely because most members are from places where English is spoken but people who live where other languages are spoken also speak English here so that the rest of us can understand them. Some who don't understand English have made themselves understood (mostly) with Google Translate.
Bem-vindo ao fórum. Como você deve ter notado, se você olhou ao redor do fórum, é predominantemente em inglês, principalmente porque a maioria dos membros é de lugares onde o inglês é falado, mas as pessoas que moram onde outros idiomas são falados também falam inglês aqui para que o resto de nós possa entender eles. Alguns que não entendem inglês se fizeram entender (principalmente) com o Google Translate (como eu fiz com isso).
Please add your location and your bike's model and model year (NOT year first registered if that's what your paperwork shows) to your profile so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).
And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and may or may not have had all of the maintenance necessary to keep it safe & reliable so it is highly recommended to download the Factory Shop Manual for your model (available through the CX Wiki - link in my signature) and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel (old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet). If your bike still has the original rubber brake line(s) (should be replaced every 2 or 3 fluid changes = 5 or 6 years) I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid). And don't forget things like the rad hoses and the boot between the engine and swingarm (they can crack on the bottom where you don't see it).