Can I connect an electric motor to the output of this circuit or does it need to be amplified ? The output I mean.

 

First, that circuit says the IC is a'555' however there are various different versions known by that number identified by different letters in front of the 555. The various versions have quite different specifications even though the basic function is the same. e.g. NE555, TS555, ALD555.
You need to check the datasheet for the particular chip you are using.

Consider the two requirements of the motor.
1. Voltage.
What voltage does the motor need for its intended purpose?
If you check the datasheet you will discover that there will be some voltage drop in the '555, so the output to the motor will be less than the supply voltage of the IC. There must be enough voltage to run the motor.
2. Current.
What is the maximum current will the motor need when fully loaded?
Check the '555 datasheet to make sure the IC can cope with that maximum current.

 

Hello,

I have changed the perspective, cut-out the schematic and reduced the size.
This results in an image that is about 10 times smaller:



As said, we need more information on the motor.
A CMOS version of the 555 can drive 100 mA.
A bipolair version of the 555 can drive 200 mA.

Bertus

 

http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm
What are the details of the motor?
Max.