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Re: throttle return spring

To: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>,
Subject: Re: throttle return spring
From: "Steven Devine" <stevedevine@rcn.com>
Date: Thu, 9 Sep 2004 14:03:30 -0700
 Paul are you retired, just glued to the internet or both? Its nice to get a
quick answer, but you are always so lightening fast.
 Im always amazed how fast you respond. How do you do it?

 SteveD


> I don't really see how using more springs might stop one of them breaking,
> using none might though :o)
>
> HS carbs had three springs - one on each throttle cam and one directly on
> the cable.  There should be a little free play in the cable and pedal to
> prevent the butterflies from 'hanging open' on the cable.  This is one of
> the many causes of not being able to reduce the idle speed to stalling
> point.
>
> The Workshop Manual appears to show a similar arrangement for HIFs but it
is
> not totally clear.  The Parts Lists are similarly unclear as they either
> split them up into 'cable return' spring (one) and 'return spring' (two),
> quote three springs, or just one, with the latter two not indicating any
> change point.
>
> There was a choke return spring of the same type as the others,  Plus
> accelerator and choke return springs as part of the carbs themselves and
not
> the linkage between them.
>
> You should find out if the sticking is in the pedal, cable or one or other
> carb, but that in itself won't help the breakage.  That will be because of
> sharp edges on the brackets wearing through them, incorrect spec i.e.
being
> over-stretched, or simply poor quality.  More springs (i.e. in parallel)
> would help to return the system fully to idle at the expense of making a
> heavier pedal, but again not reduce the likelihood of breakage.
>
> PaulH.

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