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Twin Carb Expert Required!

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#1 GT Gray

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Posted 12 August 2019 - 03:53 PM

Hi - Well I have recently fitted a couple of refurbished HS4s to my GT.

I went through them just to see that they were all ok and fitted 3 new throttle return springs from mini sport.

This is where the problem is - pushing the accelerator pedal down feels like you are depressing a clutch, new long ST throttle cable fitted everything seems to be running smooth it’s just sheer the pressure involved in pressing the accelerator down which is bugging me.

Any suggestions would be much appreciated

Cheers Gray.

#2 Dr s

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Posted 12 August 2019 - 06:36 PM

There’s a few bits that can drag. So how to describe!
The two carbs are connected on the linkage you can over open thia. Undo one end and ease it back to the car centre a mite.

You can isolate the throttle linkage by trying to rev it under the bonnet. Does that feel tight?

#3 mk1leg


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Posted 12 August 2019 - 09:41 PM

have you wound the springs too tight

#4 Daz1968


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Posted 12 August 2019 - 09:54 PM

Another thing is the route of throttle cable, it must be smooth. Also the angle the cable attaches to the throttle lever.

#5 mk1coopers


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Posted 12 August 2019 - 10:26 PM

You say you have fitted three springs, has the car got the standard style metal air box ?, as on the twins with this box two springs go down next to the carbs and the one in the middle goes up to the air box to help it return, you need to see what's causing the resistance, remove all the springs and see how free the cable is, if it all moves ok with no springs add two and see what it's like, are the springs you have the correct ones ?

Edited by mk1coopers, 12 August 2019 - 10:51 PM.

#6 nicklouse


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Posted 13 August 2019 - 12:06 AM


#7 Retroman


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Posted 13 August 2019 - 08:39 AM

The 3 springs...


You can fit one to each jet so that the choke returns so thats 2


One of the small diameter twin carb type return springs might be enough just on the throttle side, but 2 can be better


As Nick says....photos

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