Vittorazi Motors COSMOS 300 User Manual page 34

A second check of the carburetion can be made verifying the colour of the spark plug electrode.
A first control can be done, at the end of the of break-in period, in the following way:
Electrod colour
Light grey / Grey
Brown / Cappuccino
Black / Dark / Wet
Cosmos 300 – User manual – V3
Light Grey /
Grey Cappuccino
Brown / Black / Dark /
Carburetion quality
The carburetion is poor, lean. It is important
to find the cause immediately, with the
help of an authorized dealer / instructor.
Normal, Optimal, Correct.
The carburetion is rich. It is important to
find the cause immediately, with the help
of an authorized dealer / instructor.
Wet
34