Idle Question on a 60B Super with Webers

[Scott Sogge]

Last night I attempted to lower my idle speed with the idle stop screws on my Webers. Pretty basic operation, I thought. I found out that the left carb is the only one that lowers the idle speed. So I’m assuming that the linkage needs to be adjusted on the right carb.

Is there a basic routine to follow to make sure both carbs are contributing equally to idle?

Thanks in advance.

Scott Sogge

[Ken Wallace]

Scott,
Check out Brian Adams write up on Weber linkage problems
in the Tech section:

http://www.356registry.org/tech/weber_linkage.html

In the last part he talks about loose throttle control arms and his fix.

Sounds like that may be your problem.

Ken

[Ron LaDow]

Scott,

"Is there a basic routine to follow to make sure both carbs are
contributing equally to idle?
Thanks in advance.
Scott Sogge"

I don't think it's carb-specific. Release both drop links at the carbs, set the idle with the stop screws. Then adjust the drop links so they fit the carb throttle levers as-is and refit. You'll need to check off-idle sync to make sure there isn't slop someplace in the linkage.
Thanks,
Ron LaDow

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[Norm Miller]

And remember that 9 out of 4 carb. problems are in the ignition!
Does the advance return to static at idle?

Norm

----- Original Message -----
From: Ron LaDow (rwmld@email.com)
To: 356talk@356registry.com (356talk@356registry.com)
Sent: Thursday, May 01, 2008 8:24 AM
Subject: [356Talk] Re: Idle Question on a 60B Super with Webers


Scott,

"Is there a basic routine to follow to make sure both carbs are
contributing equally to idle?
Thanks in advance.
Scott Sogge"

I don't think it's carb-specific. Release both drop links at the carbs, set the idle with the stop screws. Then adjust the drop links so they fit the carb throttle levers as-is and refit. You'll need to check off-idle sync to make sure there isn't slop someplace in the linkage.
Thanks,
Ron LaDow

Post generated using Mail2Forum via email.

[Richard Towle]

I found a few things with webers on 356's that might help..might not.

First, typically I use only one idle screw to set both carbs at idle...this assumes that your crossbar linkage is in good shape.
After that is done (using a synchromter) I snug up the other idle screw while not changing idle.

The webers and the offset adapter plate create a bit of tension in the drop link.
Using the article on the registry web site, you see a great fix for this.

Basically, the drop links need to be on the same plane.
Measure the distance from the top of the drop link to the fan housing on each side.
Measure the distance from the bottom of the drop link to the fan housing on both sides.
These need to be as close to the same as possible for the geometry to work.
You end up adding spacers to both carb linkage arms...one forward and once reverse to get the drop links to be on the same plane.

It also reduces the friction in the drop links so you can get back to idle.
Sometimes you need to swap the various carb linkage arms front to back to make this work. (redline webber has all sorts of carb arms....many offsets)

I agree with the statement above...40 year old advance plate grease is very sticky...clean up the distributor, re-grease the plates, oil the unit so it springs back with little resistance...
Ignition problems are always pushed to the carbs...

That being said...the drop link setup for webers is an issue.
Read the weber articles on the registry web site...there are great pictures that show the spacers for the drop links that you need to make...they can be purchased at your local hardware store....

Rich

[Guest]

Scott,
You should get a Unisyn to make sure the air flows are equal through
each carb but before that be sure these items are in place. Engine in
good tune and the distributor's advance mechanism works correctly. If
the advance hangs it will keep the idle speed up. Set the timing and
then warm up the motor, disconnect the throttle from the carbs so it
will not influence the setting. Then set the idle speed and make sure
the air flow is even. You then want to set the idle mixture screws and
then look at the idle screws again. A mixture too rich will come down to
a high idle and then lower and maybe die, a lean mixture will come down
right away and want to die.
It is a fine feel to set carbs so give it a try.

Alan

Scott Sogge wrote:

Last night I attempted to lower my idle speed with the idle stop
screws on my Webers. Pretty basic operation, I thought. I found out
that the left carb is the only one that lowers the idle speed. So I’m
assuming that the linkage needs to be adjusted on the right carb.

Is there a basic routine to follow to make sure both carbs are
contributing equally to idle?

Thanks in advance.

Scott Sogge




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