The following listings show a variety of valve gear parts that were fitted to the SOHC CS1 Models (as opposed to the Model 30, Model 40 or SOHC Manx Grand Prix spec engine models).
Please note - we are not experts in the background and design of Walter Moore CS1 parts - but we do produce some parts for these early 1920's models, as well as 1920's OHV and SV models. If you are not sure what part you require after reading this section, or cannot see a part you require listed - you can email me at paul.norman@racingvincent.co.uk
Here is some general information on these CS1 models that may help when viewing the parts that follow:
- The first SOHC model that Norton offered was the Walter Moore designed CS1 (and CSJ) model, first raced in mid 1927 - and winning the 1927 TT, this model was first offered to the public in October 1927 - and became universally known to Norton enthusiasts as the 'Cricket Bat' engine - due to its distinctive bevel timing case and vertical tube - to differentiate it from the later Arthur Carroll design.
- When first manufactured, the Walter Moore CS1 model shared many of the parts and chassis with the OHV ES2 model, which was then considered their main Sports model, and was of a higher spec than the other OHV and SV models. If you require more information on the actual parts fitted to OHV/CS1 models in 1927 - we highly recommend you go to our Facsimile section and consider purchasing Item 0892 - which is the 1927-28 CS1/ES2 Spare Parts List. To get the full picture we also Item 0891, which is the corresponding 1927 SV/Mod18 OHV Spare Parts List - and together they are very useful for showing the differences between the CS1/ES2 and other models
- The original Walter Moore CS1 engines were fitted with coil valve springs. Talking to CS1 owners - it seems widely regarded that they were normally fitted with the larger type 1920's 'Conical' type valve cups - our Item 1029 (and with corresponding coil valve springs - Item 0966), but actually - we have been told that the first CS1 models seem to have been fitted with the earlier OHV 'small conical' valve cups, as fitted to the first 'Flat Tank' OHV models in the mid-late 1920's, we can also offer these if required (Item 1225, and corresponding valve springs 1124) - but we are told that most CS1 engines were retrospectively fitted with the later/larger conical valve springs. We believe this later larger type became standard Norton fitment on CS1 models sometime in 1928 . . . but we are not experts, and it is difficult to be definitive, as little information is now available
- The Arthur Carroll designed SOHC CS1 engine (which later evolved into the Norton International and eventually Manx models) was first raced in April 1930 in the North West 200 in Ireland (a hybrid prototype model had been shown at the October 1929 Olympia show - but it seems this may not have had engine internals fitted). The first Arthur Carroll CS1 designed production models were offered to customers in July 1930
- The CS1 SOHC model designate was given to all the roadgoing SOHC range up until September 1931, when the 'International' (Mod 30 500cc and Model 40 350cc) was announced and offered for the 1932 range. This International model became the top of the range sportier model going forward, but the slightly less highly tunied/touring specification CS1 SOHC model continued to be offered in both 500cc (CS1) and 350cc (CSJ) forms right up to the advent of WWII in 1939. Although visually very similar to the International models in engine design - the most notable differences of the CS1 models were the continued fitting of coil valve springs, a non-downdraught iron cylinder head with slightly less finning than the International models (similar to the OHV models) and sharing many of the chassis fork and wheel parts of the OHV models.
- Like the Walter Moore CS1 engines - the Arthur Carroll designed CS1 engine (to our knowledge) was always fitted with Coil valve springs - although there were various lengths and thicknesses offered over the years.
- As far as Valve spring cups and spring diameter are concerned - there were effectively 3 main types of cups fitted from 1927 when the (Walter Moore) CS1 models were first introduced, through to the last CS1 models in 1939: (and please feel free to email us if you think different, we are all still learning!):
- 1927-28? Small Conical Valve Spring Cups: The first Walter Moore CS1 models seem to have been fitted with the earlier OHV 1920's small diameter conical valve cups (the top cup was broadly conical shaped with large radial holes). It seems these were quickly discovered to not be strong enough and look to have been replaced with a larger conical type in 1928 (as were the OHV models). These are our Item 1225. We have been informed of at least one CS1 customer bike still fitted with this smaller design - although we are told most engines were retrospectively fitted with the later larger conical design. This early design was fitted predominantly to the first generation of mid-late 1920's 'Flat Tank' OHV models.
- 1928-31? Large Conical Valve Spring Cups: It seems that sometime in 1928 the Walter Moore CS1 (and OHV) models were fitted with a larger conical valve cup - which allowed for wider and stronger valvesprings. These are out Item 1029. This type of valve spring caps look to have been fitted for the remainder of the Walter Moore CS1 (Cricket Bat) production run. However, if you look at the first 'Arthur Carroll' design SOHC Spare Parts list for 1931 - our Item 1132, you will see that the SOHC shown here look very much like the same 'conical' valve caps as fitted to the Walter Moore engines (and OHV engines) - although the part number had been changed to 3X62 and 3X64. Not sure when the CS1 models changed from these to the later type, but suspect it was probably 1932-33.
- 1932?-1939 Tapered Top Cup Type Valve Cups: It seems likely that it was 1932'ish that the final CS1 OHV valve cup design was first fitted, and at the same time, the OHV models underwent the same change - these cups are our Items 0672/0673. This design of valve cups look to have also been fitted to all OHV models up to 1947, where in the 1948 OHV revamp - the top cup was changed to a flat design (our item 0674)
- For many of the CS1 specific engine and chassis parts (i.e - where different to the SOHC International/Manx models) - they were commonly shared with the OHV parts. In the case of CS1 valve gear - it seems the springs and cups were generally shared with the OHV models, and we are told that some Walter Moore CS1 owners fit later OHV ES2 valves (and maybe guides?) . . . but interestingly - the 1937-38 Spare Parts List shows the CS1 valve guides being different to those fitted to 500cc OHV models, but the same as those fitted to OHV Model 50/55 (350cc) models!!. And for these latter CS1 models - the valves are shown as being the same as those fitted to Model 30/Model40 models (i.e. parallel collet type). Therefore we cannot guarantee that any specific valve or valve guide will fit your own CS1 engine - but will be happy to provide details of our (std size) Model 30/40 Inlet or Exhaust valves and guides, as well as our OHV valves and guides.
(please remember - this information is based on our own experiences of stripping original engines or information provided from known Norton literature and owner feedback - and should only be taken as useful information - not specific guidance for your own needs - it is always the customers responsibility to ensure they are comfortable with their choice and fitment of all parts - and all responsibility of fitment lies with them).