Another way to tune up the mixture is a "Color Tune". It is an odd looking
spark plug with a clear insulator. You can actually see the color of the
flame. Temporarily replace #1 or 2 plug with the "Color Tune to set the
front carb then put it in #3 or 4 to set the rear. Orange is rich, blue is
correct, and white is lean. It is dead on and only take a few seconds.
Best regards,
Fred Schroeder
'70 2000
SRL311-13359
TDROC
Home page http://home.texoma.net/~sitsinwest/
----- Original Message -----
From: <WisslerJon@aol.com>
To: <gboone@sisna.com>
Cc: <datsun-roadsters@autox.team.net>; <tomhouse57@msn.com>
Sent: Saturday, March 30, 2002 6:19 PM
Subject: Re: EI Dizzy Conversion/Now Idle Speed and SU tuning
> Gary,
>
> You were absolutely correct. I was adjusting the damn air mixure screws
and
> not the idle screws. I finally figured out what the hell was going on.
> Fortunately for me, a neighbor who restores old Mercedes stopped by and
told
> me I had to adjust the Unisyn to get a reading (as you said) and voila !!
> Now the only problem is no matter what I do I can't get both carbs to get
the
> same reading. The rear carb, when covered by the Unisyn, causes the motor
to
> stumble a bit. I have the air mixture screw baily opened on that one.
The
> front carb barely gets a reading practically no matter what the heck I do.
I
> have it opened SEVERAL turns. Does this mean that my carbs are
essentially
> toast do you think? Despite the fact I probably have the SU's nowhere
near
> tuned, I went out for a test spin and WWWWWWWOOOOOOOOOWWWWWW !!!!! The
car
> absolutely hums !! No more stall at low RPM's, and if I punch the
throttle
> there is INSTANT response. Major improvement. Thanks again for such a
fine
> product, the excellent instructions, and the follow up advice. The wife
and
> I will heading out to dinner in the sunset tonight and I may be scaring
the
> hell out of here with my driving.
>
> 69 2000 (With the most excellent Gary Boone EI dizzy)
> 69 510 Wagon L20B (With the dash removed waiting for a dash clock)
> 69 Chev C10 4x4 307 2bl (HEI, Edlebrock manifold and carb waiting in the
> garage)
>
> (I think I have too many things going at once !!!)
> NOWROC
> Troutdale, OR
>
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