3a. BTH KD1, Lucas Magneto/MagDyno and Ignition and HT Parts

The BTH KD1 Competition magneto was the standard fitment to competition Norton Internationals and SOHC Manx Nortons. The competition versions (identified by a brass plate on its side reading either 'TT Magneto' or 'Dirt Track Magneto' and having the icompetition designate in its serial number) were fitted with platinum points and a manual advance/retard mechanism with a 3 screw inspection cover. I can supply most parts to fit this magneto and also occasionaly I have second hand parts as well. PLEASE NOTE: Some of the prices quoted in this section - particularly for small stainless steel screws may seem expensive compared to other commercially available nuts and bolts. Please bear in mind that this is because they are being made specially in small batch's for this magneto. Unfortunately the machinist charges for the number of machining operations - not the size of the screw!!

This item is the 15 tooth magneto sprocket that was fitted to most Norton single cylinder models from the 1930's to late 1950's (i.e. SOHC, OHV and SV models) and fits on the end of the magneto shaft (either Lucas Magdyno or BTH KD1 fitment). These items are just the same in profile as original sprockets - the magneto sprocket being recessed, just as the original Norton item.  Price is Each. 

This item is the 15 tooth Norton single magneto chain sprocket on the engine side - that drives the chain to the magneto sprocket, it fits on the end of the oil pump drive gear (SOHC models) or inlet cam (OHV and SV models). These sprockets are manufactured to to the original Norton profile, and were as used on most Norton single cylinder models (i.e. SOHC, OHV and SV singles) from the 1930's to late 1950's.   Price is Each.

- High quality 'Standard' type (i.e. Tungsten tips, not platinum) tungsten BTH KD1 Contact Breaker Points Set, from trusted UK supplier

- Proper Competion PLATINUM BTH KD1 Contact Breaker Points Set These are the correct platinum contact breakers, as were originally fitted to genuine competition KD1 magnetos,  Update July 2024:  Just a handful of these genuine platinum points have just come in . . . probably for the last time! . . . see listing for more detail

- This is an excellent reproduction of the aluminium cover that was fitted to many BTH magnetos from the 1920's - late 1950's, including the KD1, MH1, KD2 and other similar models.  It has a faithful reproduction of the correct BTH motif stamped into it.  Aluminium.  Price is Each

- Stainless steel hex head tapered screws for competition BTH housings. Drilled to take lockwire and with screwhead slot, just as the originals were - but CNC machined in Stainless Steel (with correct milled Imperial Hex head) - see detail listing for more information.  Price is each.  Back in stock - Nov 2024

This listing is for an unmachined cast aluminium 3-screw type points cover, to fit the manual advance/retard housing BTH KD1 TT model magneto.  The casting is a high quality (lost wax) casting, with (lathe) machining boss attached, and we supply it with an engineering drawing giving machining dimensions taken from an original cover.  See listing for further detail

Hex head bolt with screwdriver slot to fit the 3-point competition BTH KD1 cover (screw comes with steel washer)

These are the small round headed screws that retain the alloy BTH embossed cover fitted to most BTH magnetos, as shown here.  Screws are CNC turned in stainless steel to original BTH head shape, and come with washers.  Price is per pair 

- Competition Cover (3 screw type) paper gasket for BTH KD1 competition magnetos

- Correct size shims to fit BTH KD1 magnetos and other BTH magnetos with similar housing - i.e. KD2, KH1, KH2 etc.  See detail listing for more information. Available in 2 thickness - state which required.  Also, see detail for Lucas size shims

- Stainless Steel Pick Up screws to fit BTH KD1 and other BTH magnetos - in the correct wide base, shallow profile of the BTH original items, in stainless steel with washer and lightly polished head (Each - screw and washer)

- Good quality Reproduction KD1 pick up to fit BTH KD1 magnetos (Note: does not include pickup brush shown in photograph). Price is Each

- Ruubber cover that fits over pick up and HT Lead on BTH KD1 and most other BTH magnetos - essential to protect from damp/petrol etc

- Graphite HT Pick Up ferrules with spring attached (these are frequently worn on used magnetos) - I find that if this needs replacing, it also benefits to clean the slip ring contact. Great care should be taken when doing this not to damage the slip ring

- Earth brush and spring that fits in the back of the Points plate on BTH KD1, MD1 and similar BTH magnetos

- This is the large width housing plug that fits into the bottom of the KD1 manual advance/retard housing, at the base of the cable mechanism, often missing (fitting it helps prevent corrosion and dirt entering the mechanism).  Dull nickel plated as per original

- Brass hex head cable abutment that screws into the top of the manual advance/retard housing cable mechanism on BTH KD1 magnetos. the cable adjuster then screws into this item

- Plunger for manual advance/retard unit on BTH KD1 magnetos, fitted with manual advance/retard mechanism.  

- Single row ball bearing to fit BTH KD1 competition magnetos (as fitted to Norton camshaft engines). I believe this bearing also fits other similar BTH single cylinder magneto's, i.e. standard KD1 and MH1 models

- Insulator gasket to fit beahind BTH KD1 bearing. fits between bearing and housing. one required per bearing - required when building a magneto, to ensure it insulates bearing from body.  Price is each (may also fit Lucas mags - check for details)

The following section lists many of the consumables and necessary parts to refurbish Lucas Magnetos and Magdynos.  See also our other electrical section for other wiring and lighting parts.

This listing is for a bundle of 3 seperate documents: A RacingNorton publication giving a chronological list of the different Wiring Diagrams used on Norton singles from the early 1930s to 1962 (A4 format, 14 pages), a high quality facsimile of an original Lucas 1956 spare parts for Norton motorcycles pamphlet and finally an exert from an original Lucas 1957 Spare list - describing the Lucas parts used on all Norton Models from 1936-57.  These 3 documents are all produced in high quality colour A4 format and are very useful to the Norton restorer, as well as just providing an interesting read for any Norton enthusiast.  Price is for all documents

- High quality tungsten Contact Breaker Points Set to fit the popular Lucas M01L type Face Cam Mag/Dyno magneto, as fitted to most roadgoing Norton singles, from trusted UK supplier

- These are the rectangular brushes fitted to the Lucas E3 and E3L Dynamo unit that sits atop the Lucas Magdyno unit, fitted to most Norton Single Cylinder roadgoing models.  These brushes are to fit the E3(L) 2 brush type dynamo, fitted to Norton models from 1937 onwards.  See detail listing for more information. Price is Per Pair

- This listing is for the (armature) Earthing Brush and spring fitted to those Lucas Magdyno M01L magnetos that were fitted with earthing brushes - i.e. with a brass earthing side screw, as shown in the accompanyning photos.  Price is for brush and spring.

These are the coarse thread countersunk screws that are used to secure the Lucas Mag/Dyno to the cast aluminium platform used on OHV and SV Norton singles.  Price is for pack of 4