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 Post subject: De-restricting B Carbs
PostPosted: Mon May 04, 2015 8:51 pm 
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As I'm sure most of you know early B model carbs are restricted to 125bhp, these have a raised WHITE plastic centre. The later B ones have a GREEN plastic centre and do not sit as high thus allowing the slide to fully lift, giving the extra horses and De-restricting the carbs.

So to de-restrict them we're looking at filing down these plastic collars. It's an easy enough job to do if care is taken so as not to damage the fragile diaphragms. A hand file can be used but I speeded the process up a little with a air file on my compressor.

Here's the slide lifted when restricted. Note the slide sits below the upper surface by a good few mm.

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Here you will see the raised white collar in the centre that needs filing down. The red marks give an indication as to the amount that need filing away.

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Before we start we need to make sure the diaphragm is protected from damage. I used a coffee jar lid, drilled a 34mm hole and placed it over the diaphragm to protect it but allowing me to file the collar down safely.

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With the air file I filed down this collar so it was level with the inner metal ring, about 6-7mm of plastic has been filed away. Once completed tidy any loose edges and blow away the plastic dust and any dirt.

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Give them a clean with carb cleaner before installing and smearing some red rubber grease in the carb bodies groove helps the diaphragm to sit in said groove, to seal properly and help avoid nipping the diaphragm when tightening the cap down.

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Here's the slide now installed. Notice the slides ability to now fully lift liberating them few extra ponies. Repeat now with the other three. :D

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 Post subject:
PostPosted: Mon May 04, 2015 8:58 pm 
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Location: Manchester
8) Nice howto Shamus M8 =D> =D> =D> :!:

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 Post subject:
PostPosted: Mon May 04, 2015 10:11 pm 
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Location: Halifax, West Yorks E2
Well done again Shamus =D> =D> =D> =D>

Can see a few using this 'How To'

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 Post subject:
PostPosted: Mon May 04, 2015 10:24 pm 
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Joined: Sun Jun 28, 2009 10:47 pm
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Location: redcar, cleveland gpz1100 E2
well done mate, i think even I could follow this one :smt023 :smt023 :smt023


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 Post subject:
PostPosted: Mon May 04, 2015 10:26 pm 
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Think you'd be better losing a few stone Locky, ya fat f*ck :lol: :lol:

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Giddy , Green(ish) Meanie Lover

If you can't fix it with a hammer, you've got an electrical problem!


‘’The true sign of intelligence is not knowledge but imagination.’’
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 Post subject:
PostPosted: Tue May 05, 2015 10:14 am 
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Joined: Mon Sep 25, 2006 5:46 pm
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Location: Altofts Yorks. Blue 9C2 9F2 & 12B4
Nice one shamus, easy to see what's needs doing and the bit about the coffee jar lid is a good tip. =D> =D> =D>

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 Post subject:
PostPosted: Mon Oct 26, 2015 10:45 am 
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Location: pegswood,uk.. B1
Coffee jar lid. . Bloody clever idea.. nice

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