8. Douglas 2 3/4hp Parts

This listing is for a complete (Oversize) Stainless Steel Fork Spindle Kit to fit Douglas 2 3/4hp models, fitted with the earlier type forks fitted from 1913-19 - of the type shown in the accompanying photographs.  Kit consists of 4 fork spindles, 8 castellated nuts, 8 washers and 8 split pins, all in stainless steel.  Please read listing before ordering - for detailed information about Oversize dimensions

This is the castellated nut as fitted to the front fork spindles on early Douglas models - approximately 1912-1919.  Note that the thread on these nuts is 5/16 x 26tpi BSC (not Douglas 25tpi thread).  Nuts are CNC machined in stainless steel.  Price is for nut and split pin. 

This item is for the disctinctive round head 'captive notch' type engine bolts and 5/16 x 25tpi nut combination, as fitted to the top clamp of early type douglas 2 3/4hp girder forks (approx 1912-18). Item consists of one (captive type) bolt, nut, washer in stainless steel.  See listing for more detail information

This listing is for a pair of shouldered extension bolts to fit early (pre-1919) Douglas fork spindles, and allow for the fitment of an Andre Fork Damper, as per the type in this photo.  See detail listing for further information.  Price is for a matched pair. 

This item is for the disctinctive round head 'captive notch' type engine bolts and 5/16 x 25tpi nut combination, as fitted to early douglas models - i.e. 2 3/4hp (they may also fit 4hp models - but please email for dimensions).  These bolts are CNC'd in stainless steel with correct threads and have a captive silver steel pin fitted in each bolt.  Item consists of one bolt, nut and washer.  See listing for further detail

This item listing is for a set of 4 cylinder barrel base nuts to fit the Douglas 2 3/4 hp models in stainless steel with washers.  These nuts are 5/16" x 25 tpi Douglas thread and have more depth than standard.  CNC manufactured in stainless steel

This item listing is for Douglas 2 3/4hp Valve Caps, CNC manufactured from stainless steel - in 3 styles - the non spark plug/hollow type, 18mm spark plug type and 14mm spark plug.  This is a multiple item listing and it also offers Copper/Abestos type crushable valve cap washers to fit these Douglas valve caps

This item is the distinctive 0.600" Across Flats hex tappet guide that screws into the crankcase of all Douglas 2 3/4hp models (1912-1924).  These are CNC manufactured to the original dimensions in stainless steel.  Price is each 

This listing is for a set of 4 valve springs to fit all Douglas 2 3/4hp (350cc) models.  Springs are high quality UK manufactured to original pattern and design

This is the valve retaining collar of the type fitted to Douglas 2 3/4hp models, used to retain the valve springs by means of this collar and a steel pin that fitted through a hole at the end of the valve.  This type has slightly modified design over the original - having an additional milled slot, to help retain the pin and prevent collar spinning around the valve (see detail listing for more information). The collar is CNC manufactured from EN24T while the pin is from Silver Steel.  Price is for one collar and one pin (4 required per engine)

This is the valve retaining collar of the type fitted to Douglas 2 3/4hp models, used to retain the valve springs by means of this collar and a steel pin that fitted through a hole at the end of the valve.  The collar is CNC manufactured from EN24T to the original design (i.e with just a recess, we also offer a modified design - part 0730) while the pin is from Silver Steel.  Price is for one collar and one pin (4 required per engine)

This item is the distinctive long cylindrical exhaust lifter assembly plunger box, that screws into the front of the Douglas 2 3/4hp models and retains the screw in Exhaust Lifter cable adjuster and cable.  Inside the cylinder is the spring that holds the exhaust valve lifter assembly in tension.  This item listing is for the plunger box bolt (CNC manufactured in stainless steel) and spring.

This item is the barrel shaped spring that was fitted to the Douglas 2 3/4hp exhaust lifter assembly, where it feeds into the plunger bolt.  We also sell the plunger bolt as a kit (Item 0975) - but this listing is for spring only

This listing offers a small selection of 18mm Spark Plugs suitable for those older models fitted with an 18mm Spark Plug thread in their cylinder head i.e. Norton 1920's models, WD 16H models and Douglas 2 3/4hp models.  Please read the detail listing carefully - as some 'Long Reach' types are no longer available, and alternatives are also listed.  This is a multiple listing item, also offering original type 'crushable copper' washers for both 14mm and 18mm spark plugs.

This listing shows a selection of brass fittings for veteran motorcycle spark plugs, as well as some rarer spark plugs and fittings (and a nice copy of the Veteran Lodge style brass cooling fins that fit over most spark plug types).  We have manufactured the knurled brass nuts for securing the HT lead on older motorcycles (i.e. pre spark plug cap) in two main styles and a variety of threads  See item listing for full detail and options

- Woven cloth HT lead of the type originally used on many competition and roadgoing motorcycles from the early 1920's through to the 1940's.  Ochre/Orange in colour with black flecks - this HT lead is sheathed in a durable and waterproof covering that gives a very authentic look - as per the celluloid covering of the original period HT lead.  Price is per foot

Shouldered 3/8" Whit Hex gearbox belt pulley nut to fit Douglas 2 3/4hp 2-speed (and 3 speed?) gearbox's - in stainless steel with linished hex.  See detail listing for more information

This 'variable' item listing offers a number of 17/64" x 25tpi fasteners, as fitted to Douglas 2 3/4hp and 4hp motorcycles in Edwardian times.  This diameter and thread size was obscure - and specific to Douglas models of the Edwardian era, and has not been commonly available for many years.  See item listing for more detail

Good quality copper/asbestos type washer to fit both inlet and exhaust manifold nuts on Douglas 2 3/4hp models.  They should also fit exhaust on EW Models.  Price is per bag of 4

This item listing is for Douglas 2 3/4hp Inlet or exhaust nuts, with milled slots - CNC manufactured from stainless steel, but at this stage is for enquiry only. See detail listing for more information

This listing shows the various pipe fittings we can supply to fit the 1/4" outer diameter oil and petrol pipe fittings as used on the Douglas 2 3/4hp models (and other early Edwardian machines).  Most of the nuts are CNC manufactured in stainless steel, and the ferrules in brass.  Parts are listed individually or in sets - see listing for details

This is the distinctive petrol tap and filter unit that were fitted to Douglas models from 1914 - 24.  The tap itself is a good quality brass taper tap with 1/8" BSP thread into the tank - as per the original item.  The filter unit is CNC machined stainless steel with screw in seperate filter and 1/4" BSP thread outlet.  See listing for further detail

This item listing is for a length of 1/4" outer diameter bore copper fuel (or oil) pipe of 420mm (approximately 16.5" inches), which is long enough to make a petrol pipe for most Douglas 2 3/4hp / 4hp variants or other similar Edwardian bikes.  See listing for further detail.  

This item is an amended (lipped) type of bottom main jet holder, to fit early Amac carburettors - i.e. the HYK type, as fitted to Douglas 2 3/4hp Models (as listed 1919 -21 as part number 1644D).  The original Amac type main jet nut relied on a very narrow chamfer to create its seal, when screwing it in to secure the float chamber - and certainly on the original nuts I have, seem very susceptable to leaking.  This design has added a lipped flange and red fibre washer - which seats to the machined face of Amac floatchambers to prevent leakage.  See detail listing for more information.  Price is for (nickel plated) jet nut and 2 red fibre washers 

This listing is for a bottom floatchamber nut and brass ferrule to fit early Amac carburettors of the type commonly fitted to Douglas 2 3/4hp and other belt drive models of that era.  The nut is CNC machinined in stainless steel, while the ferrule is brass (with Amac sharp taper) to accept 1/4" bore copper pipe.  See listing for further detail

This is a 1/4 BSC shouldered bolt of 1.00" shaft length, with the distinctive shouldered square head, of the type used on brake assemblies of early Douglas 2 3/4hp models.  It is intended to feed through the brake rod square clevis - and then screw into the original Douglas brake pedal, then a locknut is used on the opposite side to retain it.  Consists of bolt, nut and two 1/4" washers, all in Stainless Steel

This is a shouldered bolt of 1.00" shaft length, with the distinctive shouldered square head, of the type used on brake assemblies of early Douglas 2 3/4hp models.  It is intended to feed through the brake rod square clevis - and then screw into the original Douglas brake pedal, then a locknut is used on the opposite side to retain it. This item is an alternative to item 0687 - in that it has a Douglas 25tpi thread instead of 26tpi BSC thread used on item 687.  Please measure your original brake pedal thread/bolt to ensure you know the correct thread before ordering.  It is CNC manufactured in stainless steel

This is a shouldered bolt of 0.710" shaft length, with the distinctive shouldered square head, of the type used on brake assemblies of early Douglas 2 3/4hp models.  It is intended to feed through the circular locking ring used on early Douglas 2 3/4hp brake pedal assemblies, which is used to adjust the position of the brake pedal on its shaft. This bolt has a  Douglas 0.257" x 25tpi thread, as per the original bolt used as a pattern.  Please measure your original brake pedal lock ring thread/bolt to ensure you know the correct thread before ordering.  It is CNC manufactured in stainless steel

This is a shouldered bolt of 0.710" shaft length, with the distinctive shouldered square head, of the type used on brake assemblies of early Douglas 2 3/4hp models.  It is intended to feed through the circular locking ring used on early Douglas 2 3/4hp brake pedal assemblies, which is used to adjust the position of the brake pedal on its shaft. This bolt is an alternative to Item 0689 - it having a  a 0.257" x 26tpi BSC thread.  Please measure your original brake pedal lock ring thread/bolt to ensure you know the correct thread before ordering.  It is CNC manufactured in stainless steel

This is a complete brake rod assembly to fit an early Douglas 2 3/4hp model of early  type.  It consists of Douglas modelled square brake clevis/brake rod, two locknuts, square headed brake pedal/clevis bolt, washer locknut - CNC manufactured in stainless steel from an original Douglas pattern