High quality Throttle Slides to fit original Amal 10TT Carburettors in a selection of cutaways - both LH (normal) and RH Sided types available. Manufactured to a high standard in UK - see below for manufacturing details and more information on the difference between a LH (normal) and RH sided carb.
Price is Each.
Norton SOHC Original Amal TT Fitment by year:
For those fitting a new slide to their original Amal TT carb on a SOHC Norton International - here are the more common original slide cutaways for those models:
- 500cc Mod 30 Norton International 1932 - 1934, Amal T10TT32/34 carb with: No4 Slide Cutaway ('LH' sided)
- 500cc Mod 30 Norton International 1935 - 1937, Amal T10TT34 carb with: No5 Slide Cutaway ('LH' sided)
- 500cc Mod 30 Norton International 1938 - 1955, Amal 10TT36/38 orT10TT carb with: No7 Slide Cutaway ('LH' sided) - the most normal fitting
- 350cc Mod 40 Norton International 1936 - 1937, Amal T10TT34 carb with: No4 Slide Cutaway ('LH' sided)
- 350cc Mod 40 Norton International 1938 - 1955, Amal 10TT36/38 orT10TT carb with: No6 Slide Cutaway ('LH' sided) - the most normal 350cc fitting
- 350cc models before 1936 were originally fitted with the smaller Amal 15TT type carbs, which had a smaller throttle slide diameter - sorry we do not manufacture these, but it is not unusual to find them fitted with a later 10TT carb, in which case see info above
- 350cc and 500c Magnesium crankcase (M30/M40/Manx) models from @1937 -1953 were normally fitted with Amal Remote Needle carbs, which used a different throttle slide type. We also offer these - See Item 0961.
It should be noted - for all above, lots of factors including overall carb condition can influence caburation on original TT carburettors. Therefore these cutaways should be considered a reasonable starting point. From my own persepective when tuning in the past - I have kept a couple of spare slides of different cutaways . . . so that I can try changing them when setting a carb/engine up for the first time to find the best permutation. As a general rule of thumb - a No7 slide is considered the best starting point for a 500cc Inter engine and a No6 for a 350cc engine (when fitted with a 10TT carb)
Background on 'Sided' TT slides: if your Amal TT carburettor is the more 'usual' type (i.e. as fitted to all Norton SOHC models) then the air choke casting will be on the right side of the carb body (i.e. visible from the Timing side of the bike) - this type has a 'LH' sided throttle slide fitted (this may sound counter-intuitive, but the LH refers to the side the 'notch' on the slide is positioned, in relation to the cutaway).
We offer this LH (normal) type slide in the following Cutaway Numbers: No4, No5, No6 and No7.
We also offer the less common 'RH' slide (i.e. the TT carb body will have the air choke slide casting on the left side) in the following Cutaway Numbers: No5 and No7
This less common RH slide type original Amal carb was often fitted where twin TT carbs were fitted, or if the inlet tract was pointing more towards the left/drive side of the engine.
We can supply specific information on which throttle slides were fitted to which Norton SOHC models by year and model type on request - email sales@racingvincent.co.uk. We can also provide details on some other makes on request
Manufacturing Background for these slides:
These slides are manufactured in the UK to a high standard of accuracy and finish - and the manufacturing process has been well proven over a period of many years. A special (and expensive) grade of Riveting/Naval brass is used for the slide wall- which does not split when the 'notch' is pressed into them. The slide wall and the top piece are CNC machined seperately to a close tolerance, then the two pieces are silver soldered together on a jig, before going back for final CNC machining and milling.
Finally, the fully machined slides go for grinding - to ensure the walls are true to a close tolerance (this process may be considered unnecessary with modern CNC machining - but is an additional quality factor for these slides). As a last step - the brass slides are given a very thin coat of nickel plating (only a few microns thick), which like the original period slides - was just to stop the brass walls from oxidising (and note, although the slides look shiny - this is nickel plating, which dulls off with time, as per the original period Amal slides. However, in the modern world - the original 'dull nickel' plating is no longer easily available, we are told it is now considered eco-unfriendly!).
Before packing, each batch of slides have their ground outer diameters checked (and we always test one slide of the batch after grinding in an original Amal brass bodied 10TT/RN body with no wear, to ensure each slide has full and smooth movelment, which we keep for this purpose). Finally - we also test each slide for inside fit on an original Amal TT/RN choke block (see photograph) - to ensure it fully bottoms correctly, and slides cleanly, before final cleaning and packing. Slides are supplied in their own stout cardboard box, to protect them in storage and when posted.
Remote Needle Throttle Slide Variants:
Finally - if you have an original Amal RN (Remote Needle) carburettor, as originally fitted to most pre-Featherbed M30/M40 and Manx models - we are now able to offer the distinctive 'remote needle' needle type throttle valve for these as well - see Item 0962 in this section of the RN Parts section
Update November 2021: Despite recent massive cost increases for brass/non-ferrous material (i.e. post Covid) and manufacturing costs - we have tried to keep pricing of the latest batch of slides close to the previous pre-Covid price 3 years ago (and price shown is the price you pay, no further tax to pay) - and all slide variants are now back in stock
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