NEWS FLASH - December 2013
We are now selling magneto bearings, insulators, oil seals and armature shims from our on-line shop.

Brightspark Magnetos

NEW ... Take a look at some of the equipment we use in our workshop for magneto servicing and overhauls.

 

 

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Remagnetisation

Magnetos contain a permanent magnet to produce the magnetic field which, combined with the motion of the armature, produces the electricity for the sparks. When the magneto left the factory, the magnet would have been fully charged. However, despite being called 'permanent', permanent magnets do lose strength with, for example, use, age, temperature and vibration. The magnet in a 1950s magneto typically now has only about 70% of its initial strength. You can find out more in our FAQs.

Two main effects of reduced magnet strength are:

  • The strength of spark is reduced.
    Tests we have carried out show that the sparking plug current at a particular magneto speed is roughly directly proportional to the magnet strength. So, if your magnet is 70% of full strength, your spark current is about 70% of full strength.
    (
    Here we were measuring the DC component of the HT current immediately after the spark was struck.)

  • The minimum speed required to produce sparks is increased.
    Our tests suggest that the minimum speed to produce sparks is roughly inversely proportional to the magnet strength to the power 3/2. So, if your magnet has decreased to 70% of full strength, the speed at which you need to kick over the engine to obtain sparks is about 70% higher.
    (
    Here we were measuring the magneto speed to obtain 95% of sparks with a 3-point spark gap set to 5.5 mm at atmospheric pressure.)

However, it is possible to restore the magneto's magnet to its initial strength by exposing it to a very strong magnetic field - remagnetisation.


Brightspark Magnetos is now able to offer a remagnetising service, using our specially-developed remagnetising and measuring equipment to help you restore your magneto to tip-top condition.

Magnetometer for measuring magnetic flux density at the centre of the armature cavity Measurement before remagnetisation

Remagnetiser ...

... with magneto body in place

Measurement after remagnetisation
So, we will measure the initial strength of your magneto's magnet and its polarity, remagnetise it with the same polarity (unless you ask us to reverse it), measure the resultant magnet strength, and send your magneto back to you with a report.

Initially, this service is offered only for instruments having a 2-inch or 2-11/64" diameter armature (which covers most Lucas and BTH magnetos). Because of possible customs difficulties, we regret that we are unable to provide this service to customers outside the EU.

For Lucas N1, KN1, K1F, K2F and KVF magnetos and  MO1L and MN2L magdynos, we can remagnetise the bare body without you needing to send us the whole magneto. However, for some other magnetos and magdynos which should not have the armature removed after remagnetisation, it is better if you send us the whole magneto.

The cost is GBP 18 for remagnetising a bare magneto body inclusive of packing for return, plus return postage at cost; or GBP 22 if you send us the complete magneto. Terms and conditions apply (see below).

Customers requiring the remagnetisation service should in the first instance contact us by e-mail at remag@brightsparkmagnetos.com. We can entertain inquiries in English or French. Please state:
  • Your name, full address and telephone number.
  • The make and model of magneto to be remagnetised.
  • The state of disassembly in which the magneto will be sent to us (e.g. bare body, or complete with armature and end housing)
  • Whether you will also require any EasyCaps, and if so how many of each type.
  • The postal service you wish us to use to return the item to you (e.g. Royal Mail Special Delivery, or First Class Packet). You can check Royal Mail and Parcelforce prices here.

We will then email you with a confirmed cost, payment details, and the address to which to send your magneto or magneto body.

 
Nos clients, désireux de tels services, doivent nous contacter avant tout par courriel à l’adresse suivante : remag@brightsparkmagnetos.com. Nous pouvons vous aider soit en français, soit en anglais, à votre convenance. Merci d’indiquer dans votre courriel :
  • Vos nom et prénom, adresse complète & n° de téléphone.
  • La marque & le modèle de votre magnéto.
  • Si vous allez nous envoyer la magnéto entière, ou seulement sa boîte.
  • Si vous avez besoin d'un (ou plus) condensateur(s) « EasyCap » et si « oui », quel(s) modèle(s) & combien ?
  • Le service de la Poste que vous choisissez pour le retour de votre magnéto à partir de notre point de collecte en France. Pour vous aider, voir: La Poste.

Suite à la réception de ces renseignements, nous vous enverrons notre prix ferme, l'adresse à laquelle envoyer vos pièces et vous préciserons nos modalités de règlement.

Although we make no guarantees, we aim to send remagnetised magnetos back no more than two working days after receipt, and in many cases the same day. For UK customers, this therefore means that you can remove the magneto from your motorcycle one weekend and probably have it remagnetised and ready to replace the following weekend.


Terms and conditions for Brightspark remagnetising service

Delivery to us: Customers are responsible for delivery to us, and we do not accept any responsibility for loss of, or damage to, the item in transit to us. We strongly recommend that customers use an insured and signed-for service (such as Royal Mail Special Delivery in the UK). However, in the event of loss or damage, we will provide all reasonable assistance to a customer in making a claim against the delivery service.
Our charges: The fee of GBP 18 is for remagnetising a magneto body supplied to us bare (apart from possibly including the outer-race of the drive-end bearing and oil seal). If a magneto is supplied to us with armature and end housing in place, we charge an additional fee of GBP 4 for disassembly and reassembly, but we will also grease the bearings, clean the slip ring and include in our report any comments on the state of the instrument.
Return post and packing: Our packaging charge is included in our basic price. We will return items using whichever postal service our customer requires, and we will charge postage at cost. We do not accept any responsibility for loss of, or damage to, the item during return to a customer. However, in the event of loss or damage, we will provide all reasonable assistance to a customer in making a claim against the delivery service.
Payment: All payments are to be made either in GB pounds (by cash, cheque, bankers draft, British postal order, International money order in GB pounds, or bank transfer) or in Euros (by cash, cheque, bankers draft or bank transfer). Magnetos will not be returned to customers until full payment has been received.
EU only: The remagnetisation service is only available to customers in EU countries.
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