Topica Loopframe_Guzzi Archive


Subject: Re: idle air mixture

Author: Ian Adkins

Date: Aug 23, 2000, 10:07 AM

Post ID: 1702047129


Mike,

The only two screws in question is the big one (idle speed) and the little
one (mixture).

The first adjustment is to adjust the big ones so that you balance each
cylinder. You want each cylinder to work the same. You do this by balancing
the idle speed. I would recommend that you use a carb stick to do this.

Once you have balanced the carbs and set the idle speed that you want then
you go to each cylinder and turn the little screw. In will lean the mixture
and out will richen it. The idea is that when you hit the best mixture the
engine rpm's will increase slightly. It is important that you wait approx 5
seconds between turns as to let the engine adjust to the new setup. What I
do is go to either end of the turns where I feel the engine start to run
off. Then I narrow in the range till I get it just about right.

Once everything is set you can adjust your idle by turning the screws the
same amount (in for increased idle and out for a decrease). I would also
recommend that you take your bike out for a good run and then have a look at
the plugs. They should be the same colour....tan.

While I am on that subject....I replaced the o rings on my choke yesterday.
I'm not sure if it will make a difference but the ones that were in there
were quite old and worn. I figure that old ones might richen the mixture and
be causing your problems.

Sorry about the long winded post.

Let em know how it all works out....Ian


 Thank you to all who replied to my carb screws
question. So after I take the screws out to replace
the o-rings, how do I re-adjust the mixture? And the
only control idle air mixture, right?

-Mike (69 Ambo)



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