Listed here are reproduction parts to fit Amal TT carburettors (and other roadgoing Amal carbs and even a few parts to fit much earlier Amac carbs).

There were many variations of TT carburettors made over the years, with some subtle differences between pre-war and post-war versions. Norton carburettors were also slightly different to other makes. The majority of the parts shown here are generic and will fit all models.

Castrol ValveMaster Plus - Lead Replacement Plus Octane Booster - 250ml Bottle.  If your Norton (or any other classic motorcycle) has not been fitted with new 'unleaded' type valve seats, then using modern unleaded petrol will lead to excessive wear of your valve seats.

Castrol offer Valvemaster Plus to combat this problem - just add a small measure of this liquid to your fuel tank each time you fill up and you will effectively be changing your 'unleaded' specification to 'leaded type - and therefore will protect valve seats.  

Note: Castrol make 2 versions of this lead replacement additive, a standard version, and then this version which also has an Octane booster included.  I always add this version to my British motorcycles - as I want to provide as high as an octane rating as possible to the high performance engines we are running (SOHC Nortons, sports twins etc), to reduce the possibility of pinking.  Therefore I use this in all my classic bikes.

However, should any more encouragement be needed - it is also endorsed by the Federation of British Historic Vehicle Clubs.

This 250ml bottle will treat 250 litres of fuel (1ml to each litre of fuel).  The reason I like this Castrol lead replacement offering over other makes is that the bottle includes a clever measuring device at the top - just squeeze the lower part of the container until the correct quantity of the additive fills the top measuring holder, which is graduated with the different quantities of fuel you are filling your tank with - simple!

Always read instructions before use.

Driven Defender and Booster - Lead Replacement Plus Octane Booster - 295ml Bottle.  If your Norton (or any other classic motorcycle) has not been fitted with new 'unleaded' type valve seats, then using modern unleaded petrol will lead to excessive wear of your valve seats.

Driven is a well known specialist American oil company, producting oils and additives for the motor racing industry - and one of their products is this fuel additive that protects valve seats on older style 'leaded' engines, as well as increasing octane  - just add a small measure of this liquid to your fuel tank each time you fill up and you will effectively be changing your 'unleaded' specification to 'leaded type - and therefore will protect valve seats.  

This 295ml/10 Fl oz bottle will treat up to 25 gallons (not litres . . . remember it is a US company!) of fuel.  The bottle has graduations along its side, along with a clear plastic area so you can easily see how much additive you  are adding on each fill up. 

I have recently stocked this item because other UK additives have been getting harder to find - and it is supplied by my main racing fuel distributor, so know they can be trusted.  I am using this additive myself now in my roadgoing Vincent and will report back results later in 2018

Always read instructions before use.

This Facsimile is a full and comprehensive catalog, listing good quality reproductions of original Amal specification and tuning sheets for the Amal TT, RN (Remote Needle) and GP competition model carburettors, and also includes a full list of settings for SOHC Norton models when fitted with these models as well as a comprehensive setup guide from period Norton technical guides for these carburettors.  

Price is Each

We also include the most common TT/RN carb settings for Norton 350cc and 500cc carbs, as well as some other useful carb tuning information from period Norton and other tuning experts.

Background:

The TT type competition carburettorwas first produced in the 1920's - before Amal was formed, at that time the company was called Amac - and we include a single page exploded view of that early Amac design in this facsimile.  The carburettor was then updated through the years (some pre-war versions being identifiable as they had the sub-model number relating to year stamped on the flange - i.e. TT27 or TT35), before being developed into the RN (Remote Needle) carburettor - used mainly on genuine competition bikes only, such as Manx's and KTT's, before being further developed into the GP carburettor. 

We also include one of the first of the Amal TT specification sheets (on which the cover shows the amalgamation of Amacs, Binks and B&B to create Amal), from approximately 1934, which also lists and shows pictures of many of the other carb accessories they were making in the early 1930's.  This being from an original I have in my own collection 

This Facsimile brings together copies of many of the original (and rare to find) Amac/Amal Tuning/Spares sheets for these different carburettor types - and as well as giving an interesting chronological account of how they changed - is invaluable for anyone trying to setup these carburettors - as there is a very specific order to do this in for most of the designs.

Then, in the second half of the document we have a section listing the most common settings for TT and RN carbs fitted to Norton SOHC models by year, as well as some common settings for many bikes fitted with Amal competition carbs in the 1950's (from a well known tuning book at the time). 

Finally, we also include a section from one of the period (1940's-50's) Norton technical manuals, written by the then Technical Manager for Norton's - Edgar Franks, on how to setup your road Norton SOHC for TT carbs, as well as a section on racing.

As well as being an interesting Facsimile, it contains a wealth of information for anyone who has a bike fitted with either TT, RN or GP carbs.

Printed on high quality A4 paper, with original documents carefully reproduced (and cleaned up if necessary), with a green card cover and Contents section, this facsimile is of circa 50 pages in total. 

High quality early type (i.e. pre-War and pre 1951'ish) Pilot Needle to fit original Amal TT and RN carburettors.  These tapered needles control the slow running and are often worn on originals. 

This is the rare to find early design which was fitted up until approximately 1951, it having a distincvitve design with a shorter knurl than the later type. As far as we are aware - this type of needle have not been available since they were last manufactured by Amal in the early 1950's, and virtually every original example I have seen looks very worn and tired - normally with the original knurl chewed and the needle point worn or bent.

Price is Each

These Pilot Needles were fitted to all Amal TT and RN competition carburettors, to adjust slow running.  They have a stepped, tapered needle that should close fully the small pilot hole in the body of the carubrettor needle, when fully screwed clockwise.  Original needles most often have some form of wear to the taper of the needle, and as this type of carburettor is already difficult to adjust to run cleanly at low throttle settings - a worn needle will easily compound those issues.

We manufacture these needles to the original design, and an original early type Amal TT needle was used as the template (the needle length is different to the later Long Knurl design (that we also offer - see Item 0154).  The main knurled body has the same dimensions as the original, and most importantly - the needle length protrudes into the carb the same as the original needle.

The body type on this pilot needle is CNC manufactured from brass, as per the original Amal items, then Satin Nickel plated.  It has a fine knurl, and a distinctive stepped shape that makes it easily identifiable from the later design.  If you are restoring an early competition model or SOHC Norton, then fitting this type of Pilot Needle gives that extra level of authenticity.  I am not exactly sure the date that the design was changed to the later type - but believe it was approximately 1951 - All TT or RN carbs before that time would have been fitted with this type of Pilot Needle.  Factory pictures of the Amal TT with larger type 302 Floatchamber still showed this needle type fitted - meaning it could have been used later than 1951

Note, we also offer the later 'Long Knurl' type TT/RN Pilot Needle - Item 0154 as well as the longer needle type to fit later Amal GP carburettors - item 0293.

these pilot adjusters control the slow running, and the needle often wears on originals, that can affect the adjustment available - fitting a new needle will help resolve this.  Note - we also offer the brass pilot housing that screws into the carb body as well as both springs fitted to this adjuster - the internal coil spring as well as the external leaf spring - Items 0155, 0156 and 0157 respectively, all UK manufactured.

Pilot Needle Assembly With Springs:  It is rare to find an origina Amal TT or RN carburettor these days that is still fitted with the correct and full Pilot Needle Assembly.  Originally the design consisteed of a brass threaded piece that screwed into the carb body, which had a special black stained spring clip mounted behind it.  The purpose of this spring clip was to act against the knurl of the Pilot Needle (both the early short type and the later long knurl type), and stop it rotating once set.  Often these seemed to have been removed (they can sometimes make adjustement more fiddly - but are required!), or got rusty and broke.  We can also supply these - Our Item 0157. 

However, the original Pilot Needle assembly was also designed to have a small coil spring fitted inside the brass threaded piece, which fitted around the shaft of the Pilot Needle, and helped apply some positive pressure to the needle when adjusting it.  These are frequuently lost or omitted on TT and RN carbs today.  Again we supply this spring - Our Item 0156.  Both springs are copied directly from original examples.

Early Amal TT (and Amac??) Needles? - Very early Amal TT carbs (i.e. pre-1930) have lots of minor diffences to the later carbs.  I cannot be sure as I no longer own an early carb (I let a TT27 Norton carb go years ago and have regretted it since!) . . . but I think the pilot needle may have been slightly shorter than the 'standard' TT/RN pilot needle.  If you have an early carb and would like to check, please email us at sales@racingvincent.co.uk, as I have a few pilot needles made with a fractionally shorter needle. 

High quality Pilot Needle to fit original Amal TT and RN carburettors.  These tapered needles control the slow running and are often worn on originals. This is the later type most often seen fitted from late 1940s onwards - identifiable by a long knurl and screwdriver slot. See listing for more detail.

Price is Each

These Pilot Needles were fitted to all Amal TT and RN competition carburettors, to adjust slow running.  They have a stepped, tapered needle that should close fully the small pilot hole in the body of the carubrettor needle, when fully screwed clockwise.  Original needles most often have some form of wear to the taper of the needle, and as this type of carburettor is already difficult to adjust to run cleanly at low throttle settings - a worn needle will easily compound those issues.

We manufacture these needles to the original design, and an original Amal TT needle was used as the template.  The main knurled body has the same dimensions as the original, and most importantly - the needle length protrudes into the carb the same as the original needle.

The body type on this pilot needle is CNC manufactured from brass, as per the original Amal items, then Satin Nickel plated.  It has a fine knurl, as well as a screwdriver slot, allowing for fine adjustment, either by hand, or by screwdriver.  Note - this design was the later Amal TT/RN design for this type of carburettor - I cannot be sure, but believe it replaced the earlier dessign sometime in the late 1940's.

Update 2022:  Note, we can now also offer the earlier 'small design' pilot needle, which to our knowledge has not been available since Amal themselves changed the design in the late 1940's, this earlier design was fitted on all pre-war carbs - see our Item 1115

We also offer the longer needle type to fit later Amal GP carburettors - item 0293.

these pilot adjusters control the slow running, and the needle often wears on originals, that can affect the adjustment available - fitting a new needle will help resolve this.  Note - we also offer the brass pilot housing that screws into the carb body as well as both springs fitted to this adjuster - the internal coil spring as well as the external leaf spring - Items 0155, 0156 and 0157 respectively, all UK manufactured.

Pilot Needle Assembly With Springs:  It is rare to find an origina Amal TT or RN carburettor these days that is still fitted with the correct and full Pilot Needle Assembly.  Originally the design consisteed of a brass threaded piece that screwed into the carb body, which had a special black stained spring clip mounted behind it.  The purpose of this spring clip was to act against the knurl of the Pilot Needle (both the early short type and the later long knurl type), and stop it rotating once set.  Often these seemed to have been removed (they can sometimes make adjustement more fiddly - but are required!), or got rusty and broke.  We can also supply these - Our Item 0157. 

However, the original Pilot Needle assembly was also designed to have a small coil spring fitted inside the brass threaded piece, which fitted around the shaft of the Pilot Needle, and helped apply some positive pressure to the needle when adjusting it.  These are frequuently lost or omitted on TT and RN carbs today.  Again we supply this spring - Our Item 0156.  Both springs are copied directly from original examples.

- Brass pilot needle insert to fit in both original Amal TT, RN and GP competition carbs (all types) - these screw into the carburettor body, then the Pilot Adjuster Needle Screw screws into this brass insert. 

Price is each.

These are used to hold and allow adjustment of the Pilot Adjuster Needles (our Items 0154 or 1115 for the Amal TT or RN type carbs, or Item 0293 for GP Carbs).  They screw into the main body of the carburettor on a small coarse thread, but then have a very fine thread on their outer diameter, that allows for very fine adjustment. 

They have a small slotted (milled) end, that allows a wide screwdriver to screw to screw them into the carb body - however, it is not unusual for the very fine thread to get damaged over the years, or people try and unscrew them with a screwdriver that is not wide enough, and only makes contact with the slot on one side - almost always damaging the very fine thread.  If this occurs, the consequence is normally that the Pilot Adjuster will not turn easily, or even lock up completely - making it useless.

Therefore when fitting or removing this item from your carb body - always use the correct screwdriver tool - I often get a scrap piece of flat steel plate just thick enough to fit in the slot but wide enough to make contact on both sides - also lightly grease thread for best results.

By the way - there was normally a small coil spring fitted into the recess of this insert (our Item 0156), but you will often find this missing - it is better for it to be fitted.  Additionally there was a leaf spring (that made contact with the knurl on the Pilot Adjuster - Our Item 0157), they should also be fitted and fit on the back shoulder of the brass insert.

This is the small coil spring that fits inside the Pilot Needle assembly on original Amal TT, RN and GP carburettors.  This helps keep the pilot in tension and helps ensure it does not unscrew, particularly if the leaf spring is lost or tension gone.

These springs are UK manufactured by us to the original specification

Price is each

Pilot Needle Assembly With Springs:  It is rare to find an original Amal TT or RN carburettor these days that is still fitted with the correct and full Pilot Needle Assembly.  Originally the design consisteed of a brass threaded piece that screwed into the carb body, which had a special black stained spring clip mounted behind it.  The purpose of this spring clip was to act against the knurl of the Pilot Needle (both the early short type and the later long knurl type), and stop it rotating once set.  Often these seemed to have been removed (they can sometimes make adjustement more fiddly - but are required!), or got rusty and broke.  We can also supply these - Our Item 0157. 

However, the original Pilot Needle assembly was also designed to have a small coil spring fitted inside the brass threaded piece, which fitted around the shaft of the Pilot Needle, and helped apply some positive pressure to the needle when adjusting it.  These are frequuently lost or omitted on TT and RN carbs today.  Again we supply this spring - Our Item 0156.  Both springs are copied directly from original examples.

Distinctive leaf spring that fits against Knurled pilot needle on Amal TT, RN and GP carburettors

These leaf springs fit both the early pre-war and later 'straight knurl' type pilot jets (which we also sell - Item 0154 for TT and RN carbs, Item 0293 for GP carbs) and ensure they do not come loose or change adjustment in competition through vibration.  Originals are often missing or in poor condition.  These have been specially made by us in black finished spring steel and identical to the original pattern.

In the accompanying photographs you can see two Amal RN carburettors (long neck versions as originally fitted to Manx Nortons) - the carb on the left is fitted with the earlier (pre-war style) pilot adjuster and the carb on teh right shows the later 'straight knurl' type adjuster fitted to later TT/RN carbs and GP carbls . . . all are fitted with the spring sold here.

We keep these sprayed in Duck Oil to prevent rusting in storage - sorry not cheap, but the pattern work to have these springs made was not cheap!

- This is the small screw that fits on to the body behind Pilot Needle on Amal TT and RN racing carburettors - Like the throttle adapter peg, this item is often found rusty on original carbs

this screw is CNC manufactured in stainless steel