BT7 throttle spring ?

[bighealeysource]

Hello all,
On my 61 BT7, the throttle response is stiff as though a spring
is too tight and you have to push a bit harder to open the
throttles on the carbs. It may be as simple as a stiff
pedal spring but before I start doing contortions trying to get
to that thought I would ask the Healey gang your thoughts.
Any ideas ?
Thanks,
Mike

 

[Rob Glasgow]

I had the same issue on my BT7. Found a reference document on-line somewhere dealing with SU carbs. In it, the author recommended loosening the clamps that tighten the springs on the throttle shafts and let the springs "relax" (unwind). Then rotate the springs and clamps until you feel the slack is gone. At that point, continue rotating another 1/2 turn. Do that to each shaft spring. There is one for each carb. That will put enough tension on the spring to close the carb butterfly but not enough to make it hard to open the throttle. I found this worked perfectly and made the accelerator pedal easier to modulate. Especially when I let someone else drive it.
Maybe someone remembers where to find the article on the SU's.

 

[bighealeysource]

Hey Rob,
Thanks for getting back with your advice ! Was hoping it might
be something simple. I'm going to try your solution this
weekend and hope it works. I'll let you know.
Regards,
Mike

 

[Rob Glasgow]

Mike, I found the link to the article I mentioned on how to set the springs. It's in para. X.A. This is a great article about SU carbs. Rob

https://www.jcna.com/library/tech/tech0006.html

 

[bighealeysource]

Thanks again Rob !