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Tuning the carby - Mixtures
https://www.ausmini.com/forums/viewtopic.php?f=2&t=20314		 Page 1 of 1
Author:  pristic [ Mon Jun 19, 2006 4:22 pm ]
Post subject:  Tuning the carby - Mixtures
Howdy,

I have got a single SU. I was told by the mechanic (mate) that its running way too rich.
He couldnt adjust the mixtures right away and I had to go.

Reckon I can adjust them myself? Is it hard?
1. To adjust the mixtures I need to undo the slow idle screw until it goes into fast idle.
2. Then, adjust the jet nut under the carby until I get desired mix (too lean, it'll stall, too rich and it'll miss and splutter)
3. When happy, return the slow idle screw to where it sounds right.

Does that sound right?

Peter.
Author:  68matic [ Mon Jun 19, 2006 4:41 pm ]
Post subject: 
no not a difficult thing to do at all. can be done in less than 10 minutes :wink:

pm sent
Author:  Gadgets mini [ Mon Jun 19, 2006 4:42 pm ]
Post subject: 
whilst by no means an expert

sounds about right

Looking down onto the Carbie (straight onto the dashpot)

if you turn the mixture screw clockwise it will richen it

and turning it Anti clockwise you guessed it will lean it out

by turning it you dont need to turn it by huge amounts to make a difference turn it one or two flats then try it
( By a flat i mean the Flatt parts where a spanner would grip onto)

hope this helps

Cheers
Gadget
Author:  pristic [ Mon Jun 19, 2006 5:21 pm ]
Post subject: 
Thanks for all the info... I guessed it wasnt difficult... but thought I would check the REAL manual (Ausmini.com) :D

Peter
Author:  Hanra [ Mon Jun 19, 2006 6:50 pm ]
Post subject: 
Wat u should do is bring the idle up to around 1000rpm. On the side of the carb body there is a pin, lift that pin up about 3/4's of its travel, if the engine speed increases and stays high then the mixture is to rich, if the revs fall and the engine sounds like its going to stall then its to lean. The revs should rise and then fall back to about original. Then the mixture is ok.

Provided u have the correct needle u can wind the adjusting nut fully lean, then back it out 2 1/2 turns rich approx. That is a good starting point.
Author:  K-Bar [ Mon Jun 19, 2006 7:33 pm ]
Post subject: 
hey..

ive been told that the button underneath the Dashpot becomes unusable once you have a sports/upgraded cam in the engine...

is this true???
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