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 Post subject: 40DCOE31 Webers
PostPosted: Sat Mar 12, 2016 6:36 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
I have two of these that I am putting kits in butterflies and all.
Both have three progression holes off idle that appear identical in size and spacing.
Serial numbers way different.
I have four new 78degree butterflies.The first progression hole is partionally exposed at closed throttle on both sides of carb A
the second carb it is totally exposed.So I find that the old 79 degree butterflies put in this carb make it better but one side is more exposed than the other .
Do I solder the butterfly above the progression hole and sand it to try and cover it as it should be???
Try and make all equal or what .
Did tolerances vary this much.Please help before I do something stupid with them LIKE a BFH


Last edited by Ian_B on Sun Mar 13, 2016 6:16 am, edited 1 time in total.

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 Post subject: Re: 40DCOE31 Webers
PostPosted: Sat Mar 12, 2016 8:18 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
Is there anyone in Australia can fix this re redrilling and blocking progression circuit holes


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 Post subject: Re: 40DCOE31 Webers
PostPosted: Wed Mar 30, 2016 2:28 pm 
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848cc
848cc
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Joined: Mon Aug 07, 2006 2:15 pm
Posts: 425
Location: Perth, WA
Modification of progression holes is a very precise job. If you contact ReCarb https://www.recarb.com.au/ they should be able to help you.

It sounds more like that throttle plates are not installed correctly or the throttle arm itself is bent if there is such a difference between the two at FULL closed position. So long as the body number is the same, the progression holes should be the same, unless they've been modified after the fact.

I would not recommend blocking any progression holes until you know exactly what is going on.

Cheers,
Keels.

_________________
-Wasabi
1972 Clubman - Daily Driver
1962 850 - EW1 Powered


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 Post subject: Re: 40DCOE31 Webers
PostPosted: Thu Mar 31, 2016 6:26 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
Didn't need to .With four new 79 degree butterflys all is good but progression comes on at slightest touch of throttle .
With fully closed throttle they are all now on idle circuit only.
Cheers.


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 Post subject: Re: 40DCOE31 Webers
PostPosted: Thu Mar 31, 2016 8:46 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
There are drilling mods for butterflys Originals were .Need to get running and play eventually.


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