Benzine
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| posted on 23/7/05 at 12:20 AM |
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Sticking weber linkage
I recently got my engine working and idling! 
But it only idles when I physically hold up the throttle linkage so the carbs are closed and are running on the idle system. The springs on the
linkage return the throttle each time but not quite far enough so it leaves them open and the engine revs high.
Is this a case of the springs being too weak or the way I've connected it all up being wrong in some way.
The arrow indicates the way I pull the linkage for it to idle. When this is pulled the engine idles perfectly, however when the throttle is used and
then released it doesn't return and the revs shoot up. No 3 screw is already screwed out so that's not stopping it close
1 and 2 are where the 2 linkage parts are bolted, could these be too tight? They don't seem to be
4. Could i fit a spring from here down below to return it?
Spanks for any help!
The mental gymnastics a landlord will employ to justify immoral actions is clinically fascinating. Just because something is legal doesn't make
it moral.
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Mix
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| posted on 23/7/05 at 06:36 AM |
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Isn't it just a case of shortening the linking rod, (the one with the two ball joints)?
Mick
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britishtrident
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| posted on 23/7/05 at 06:42 AM |
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Assuming the throttle cable isn't too tight and the carbs are somewhere near synched.
Remove the carbs turn them upside down, on the bottom of of each carb you will see a plate with 4 screws. remove it, below it you should seen a spring
connected to arm that goes through the throttle spindle. Check the return spring and also check the roll pin isn't sheared.
[Edited on 23/7/05 by britishtrident]
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Benzine
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| posted on 23/7/05 at 07:54 AM |
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quote:
Originally posted by Mix
Isn't it just a case of shortening the linking rod, (the one with the two ball joints)?
Mick
Since that pic was taken I did try that and it didn't really do anything  Thanks though 
The mental gymnastics a landlord will employ to justify immoral actions is clinically fascinating. Just because something is legal doesn't make
it moral.
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Peteff
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| posted on 23/7/05 at 10:23 AM |
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Slacken the nut on the cable adjuster 5 and screw it in. Is there a damping spring on the balance underneath the flat piece 6. Have you lubricated the
linkage at all, try a spot of 3 in 1 or some WD on the joints and on the butterfly pivots and work them a bit to loosen it up. It'll be alright
when the newness wears off 
 
Rescued attachment linkage.jpg
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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mac1ZR
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| posted on 23/7/05 at 11:45 AM |
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without the throttle cable attatched,can you open the throttle fully and then will it close again?if so we had this problem.we changed the point where
the cable was attatched to the accelerator pedal so it had a larger range of movement.works perfect now.
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rusty nuts
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| posted on 23/7/05 at 05:54 PM |
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Try disconnection the rod from top end , if engine then idles correctly problem is with linkage . If engine still races problem is with
carbs/adjustment/ balance . This should point you in the right direction
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Northy
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| posted on 23/7/05 at 06:06 PM |
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I had a similar problem with a set of old carbs and it was the throttle spindle bent. Did you tighten them up too tight? 
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Benzine
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| posted on 23/7/05 at 06:17 PM |
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What's the throttle spindle?
At the moment i'm using 2 bungees between the linkage and the engine mount below which is working, but I don't want to keep it this way
I'll try out these suggestions tomorrow, thanks
The mental gymnastics a landlord will employ to justify immoral actions is clinically fascinating. Just because something is legal doesn't make
it moral.
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rusty nuts
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| posted on 23/7/05 at 06:25 PM |
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Under the white plastic caps I think you will find are air bleed screws , If all else fails try taking caps off , you will probably find screws with a
lock nut , slacken lock nut and gently screw in bleed screws, until they just touch the seats . Count the number of turns in case you have to reset to
base setting. start engine and check/ adjust idle .
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Northy
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| posted on 23/7/05 at 06:51 PM |
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The throttle spindle is the bar through the middle that holds the butterflies. Did you tighten the nuts on this shaft when you put the linkage bits on
the end?
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Benzine
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| posted on 23/7/05 at 08:18 PM |
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quote:
Originally posted by Northy
The throttle spindle is the bar through the middle that holds the butterflies. Did you tighten the nuts on this shaft when you put the linkage bits on
the end?
When I got the carbs i needed to undo them all to fit the parts to make the 2 carbs work together (as they didn't come assembled in any form) so
yes I did undo everything and tighten
The mental gymnastics a landlord will employ to justify immoral actions is clinically fascinating. Just because something is legal doesn't make
it moral.
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Northy
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| posted on 24/7/05 at 10:18 AM |
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But did you over tighten?
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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