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You want to know how a Desmo system works?

 
This is the triple overhead cam set-up used by Ducati on their 1950's GP racers
 
 
This complex design was later simplified considerably for production purposes
These are all the component parts of the modern 2-valve Desmo valve-train, in this case the 900SS
 
 
The simpler SOHC set-up was used on the later singles, bevel twins and DesmoDue's in this basic configuration right up to the current models.
 
This clever rotatable 3D pdf image shows how it all fits in the head (from Bluming.com)
 

The 2-valve Desmo principle is shown well in this animated graphic.
 
 
And this is the latest design of Desmo valvegear used on the DOHC "four-valve" engines
 

Slower running 4V animations can be more easily understood.

 

 

We are grateful to Miroslav Mitrovic of Bluming.com for allowing DOCGB the use of the excellent animations and high quality illustrations of the Desmo valvegear.

http://www.bluming.com/projects/desmo.htm

This is Miroslav with his 999R