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Motor running tooooo rich

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paslow22 Seriously Crusin Dubber

109 posts · joined Oct 2015 ·

#1026912
Hi,
I have just put the 1835 motor in after a rebuild and a repair kit through the 40mm twin kadrons and had the throttle bodies re bushed also set the carb pumps at 5mm, and there was vast amount of black from the exhaust.

Main jet is 130, idle jet is 55

I cleaned the carbs, dried them with the compressor, new gaskets, needle and seats, found one was sticking and changes it. dog bone, shaft, bowl.
Took and the small balls and cleaned it out.
Altered the pump for less pump travel same problem.

Screwed in the air mixture screw until it ran rough then backed it out.
Any ideas please.

Thanks
Darryl

Gracey Wolfsburg Wizard

511 posts · joined Feb 2003 ·

#1026913
What fuel pump and pressure are you running? I know F all about kads but plenty about webers and they're very sensitive to fuel pressure.

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 ·

#1026914
I'm guessing it was sucking air through the old leaking bushes.

Now you have had it re-bushed it will be sucking fuel instead.

Is the black at idle or at revs?

jets seem "about right" according to Mr Google - but like above i know SFA about Kads

A blat on a dyno would help
Futue te ipsum!!!

beetleboyjeff Custom Title Time!

1,790 posts · joined Feb 2009 ·

#1026916
I believe they are very sensitive to fuel pressure - they reckon you really should run a pressure regulator - about 3psi from memory
From your ole' mate Jeff

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1026920
No more than 3psi for pretty much any carb set up. There's a facet fuel pump specially made for this pressure output and also does away with prone to failure Brazilian VW pumps or chinese ones.

Also need to know what the air jet is as 130 main and 55 sounds good for your engine but if the air is under 160 then will definately run rich above idle. If it soots up doing a test at idle then I'd say high fuel pressure just cause the 55 is a good size.
madness is in the eye of the beholder 👍

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 ·

#1026926
Suggestion THROW the CADS away and get some webbers or Dells

Will be much easier then and cheaper in the long run
I read it on FACEBOOK so it must be true


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HappyDaze Superannuated

2,887 posts · joined Jun 2009 ·

#1026927
Float levels ?
I'd rather wear a Beetle out by racing it than by polishing it!

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1026942
vw54 wrote:Suggestion THROW the CADS away and get some webbers or Dells

Will be much easier then and cheaper in the long run
What's wrong with Kads? Good flexible carb from a mild 1600 to 1900cc motors. Obviously won't give the performance of a single choke per cylinder but they're far less expensive to buy than IDF's etc and give good fuel economy. Loads of folks in UK and Europe have fitted these with good out the box results.
madness is in the eye of the beholder 👍

bugzla Custom Title Time!

1,164 posts · joined Jun 2007 ·

#1026952
who does dell jets here in oz

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 ·

#1026955
bugzla wrote:who does dell jets here in oz
What are you after.
I have some jets and vents for sale
Futue te ipsum!!!

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1026978
bugzla wrote:who does dell jets here in oz
Look for a rolling road that can tune carbs. They should be able to help.
madness is in the eye of the beholder 👍

bevoracing Officially Full-On Dubber

327 posts · joined Jan 2009 ·

#1026985
It might be worth checking if the problem is only on one side. Check the plugs. Perhaps there's only a problem with 1 carb? May have left the washer off the needle & seat or one is faulty. Worth a look.
Tony
Country Buggy King & Link Pin Overhauls, Type 1 & 2 King Pins, General Machining.
http://forums.aussieveedubbers.com/viewtopic.php?tid=74138
My car is KO813