Air Adjuster Spring or Early Type Throttle Spring to fit Original Amal TT/RN carbs (Each)

Product no.: 0850 TT Spring

In stock

£2.90
Recommended Retail Price, plus delivery


This is the spring of the correct dimensions to fit the Amal TT/RN/GP air adjuster assembly.  However, It is also of the type shown fitted to earlier Amal TT and RN carburettors, before the introduction of conical springs on competition carburettors. 

These are high quality UK manufactured (plated) springs, of similar strength to originals.  We use them in our Air Adjuster kits.

Price is Each

Earlier TT and RN Carburettor Background:

As well as being of the type fitted to the competition air assembly - this type of spring were also of the type that were found fitted to Amal TT and RN carburettors before the introduction of the more commonly found conical spring (which we sell - Item 0144).  They fit neatly in the recess at the top of the TT/RN carb top, where the original type cable adjuster fitted - this being a slightly larger hole than later TT/RN/GP carbs, which had a smaller adjuster and used the later conical spring.

Another give away if you are not sure which type of spring your original TT/RN throttle slide would have been fitted with - the top of the earlier throttle slides also had a small recess in the top of the cable holder area, to fit the spring - and as you can see in the accompanyning photograph - our springs fit exactly in that rececss (the photograph shows an original early RN slide).  Later slides had a slight recess around the top of the slide to fit the later conical spring (and all our replacement TT and RN slides have this recess for the conical spring).

However, it must be noted that although useful to use for this purpose - you must be comfortable yourself that you choose a spring (either conical or straight type like this item) that is of satisfactory strength to ensure the slide will close fully.  Different people have their own preference on throttle spring strength - some people do not like to have to exert a lot of effort to open the throttle - but it is important to adjust any throttle spring to ensure the throttle will close fully if you take your hand off the twistgrip.  In the past I have adjusted the length of the spring a small amount - to ensure that the throttle will easily close fully once I have let go of the twistgrip.

Note, some people prefer the conical throttle spring anyway, and retro fit those to the earlier carbs - personal choice, but always make sure they are fitted correctly and the throttle can close and open fully

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Browse these categories as well: 2.a Parts to fit: Amal TT (and some 276/289) Carburettor, 2.b Parts to fit: Amal Remote Needle (RN) Carburettor, 2.c Parts to fit: Amal GP Carburettor