Did Kino finding the pearl result in more good or bad consequences?

Finding the pearl resulted in more negative consequences than positive ones.

When Kino found the pearl, he thought that all of his problems were solved.  He expected to be able to sell it and he dreamed of all of the wonderful things he could do with the money.  However, the pearl resulted in nothing but negatives. 

The pearl is wonderful, beautiful, and big.  When Kino finds it, it should end all of his troubles.

Kino...

Finding the pearl resulted in more negative consequences than positive ones.

When Kino found the pearl, he thought that all of his problems were solved.  He expected to be able to sell it and he dreamed of all of the wonderful things he could do with the money.  However, the pearl resulted in nothing but negatives. 

The pearl is wonderful, beautiful, and big.  When Kino finds it, it should end all of his troubles.

Kino lifted the flesh, and there it lay, the great pearl, perfect as the moon. It captured the light and refined it and gave it back in silver incandescence. It was as large as a sea-gull's egg. It was the greatest pearl in the world. (Ch. 2)

The first problem with the pearl is that it is so big that the pearl buyers will not buy it.  They try to trick Kino, colluding with each other to convince him that it is worthless.  Since Kino can’t sell it, it doesn’t bring him the fortune he hoped for.  Instead, it brings him fame.  Unfortunately, the fame meant that people tried to steal the pearl.

Juana declares the pearl evil.  She is superstitious, and she is sure that the pearl will destroy them if they keep it.

“This pearl is like a sin! It will destroy us," and her voice rose shrilly. "Throw it away, Kino. Let us break it between stones. Let us bury it and forget the place. Let us throw it back into the sea. It has brought evil. Kino, my husband, it will destroy us." (Ch. 3)

In the end, the pearl does bring bad luck. Kino’s son Coyotito was killed.  Kino only wanted to protect Coyotito and be able to take him to a doctor for the scorpion bite and buy him whatever he could need.  Instead, the pearl destroyed them all, just as Juana predicted.