[Healeys] Gunson Colotune

[Patrick Yoas]

From: Oudesluys <coudesluijs at chello.nl>
To: Austin Healey <pajtamuvek at gmail.com>
Cc: "Steve B. Gerow" <steveg at abrazosdata.com>,
    "healeys at autox.team.net" <healeys at autox.team.net>
 
 
** I have personally seen carbs tuned by "turning off" each carb while the
other carb was being tuned. A mechanic I used to use while stationed in the
Navy in Rhode Island used to do it.
 
Engine warm and in tune (timing, dwell, etc.)
 
Slacken connecting carb linkage
 
Turn off carb you're not adjusting by raising the jet to "flush" position and
inserting a screwdriver to lift up the carb piston about 1/2" for carb not
adjusting.
 
You will have to set carb your're adjusting to a fast idle to keep enging
running. Do not set too fast but only enough so that engine runs.
 
Using a tach that has a large read scale and doesn't jump all over the place
you will be able to adjust the mixture just like in the book with a slight
increase and a slight tapering off when it's adjusted correctly. Do not use
the small piston on the outsude of the carb but instead use a small
screwdriver to lift the large piston a "skoosh" to check mixture strength.
 
When done adjusting with this carb, do the same to the other carb including
turning it off. Count the turns on the jet screw so that when you are done
adjusting with the other carb you can re-set this carb.
Patrick
Owned BJ8 since 1972

Problem with exhaust gas analysing equipment with multi carb engines is
that you cannot tune the carbs individually, you do not know which carb
to work on and when it is set properly. One can be a tad to rich while
the other is lean resulting in an overall acceptable exhaust gas result.
Kees Oudesluijs
NL