Topica Loopframe_Guzzi Archive


Subject: Left and right carb settings

Author: Juha Vattulainen

Date: Apr 23, 2001, 6:20 AM

Post ID: 1706429371


Hello everybody,

Snow is gone and the outside temperature is reaching values over +10 C. So
it is time to start a new riding season ! My bike is a -72 GT850 with 29 mm
VHB carbs. Several manuals seem to give different settings for the idle
mixture screws in the left hand right hand carbs.

After tuning the idle using the idle mixture screws and the slide stop
screws it really seems that I can reach smoothest idle when the mixture
screws for the left and right cylinders have a difference of about half of
a turn. So everything is OK and exactly as the manual says.

But curious as I am I am now just wondering the reason for this. Is it because

A. the left and right cylinders require a different mixture ? or

B. in order to provide same mixture for both cylinders the mixture screws
need to be adjusted this way because of some design feature in the CD & CS
carbs ?

Could someone on the list enlighten this ?

Best regards, Juha Vattulainen (Finland)

PS. Very useful info on Dell'Orto's, for example part diagrams and part
lists can be found fromhttp://www.racecar.co.uk/dellorto/index.htm.

Entire thread: