BT-H Magnetos Ltd.

Mag-Dyno

All sold.  Another batch is unlikely as it is not economically viable to produce this unit at this sort of price.

New Development.  We are currently developing a new magneto-alternator unit as a direct replacement for the mag-dyno.

A traditional Mag-Dyno for people who want to retain their original appearance and combined dynamo and don't want to rely on a battery charging system.

This is a deviation from our normal practice of only supplying completely new instruments but it is close as you will get to as a new mag-dyno that really works.

The Mag-Dyno was fitted on thousands of bikes ranging from the honest everyday work horse to the sporting B.S.A Goldstars.

Brief Specification:

Key Benefits

We have been asked for a solution for the "tired" mag-dynos that were fitted to hundreds of thousands of British bikes.  The BT-H, MD1R mag-dyno conversion is for people who want  to  enjoy the benefits of modern ignition technology and be able to refit an original dynamo without having to upgrade their machines charging system.  This is NOT a conversion to battery nor is it a normal renovation with a rewind.  We use none of the original mag-dyno's electrical components.

We build our magneto generator technology inside an original case.  This actually involves more work than making one of our own magnetos as we have to machine out the old magnets before we can start. 

The original mag-dyno is stripped and the original armature is disposed of.  The insides are machined out,  the cases are cleaned and bead blasted before proper steel bearing housings are bolted in.  Our BT-H magneto generator assembly is then fitted inside.  This gives you all the usual benefits of a new BT-H magneto.  You get a "new" mag-dyno with electronic advance/retard, proper journal bearings and no points.  It is supremely easy to time and because it is a magneto you won't be stranded if your battery or charging system fails.  A very small, external, high tension coil is supplied with this instrument.  This can easily be fitted in any suitable out of the way place on the bike.  The icing on the cake is a new end cap and pillar/retaining clip manufactured in stainless steel.

The picture to the right is the first "BT-H mag-dyno" we made.  It is fitted to Tony's Ariel 350 that he has owned for over 30 years.  It still has the original, tarnished spring clip and end cap.  (Is this taking originality too far?)  
These parts are replaced with new  stainless steel components on your magneto so your magneto will come back looking and working better than it ever did when new.

Tony and wife Linda took part in a week long Irish vintage event using his Ariel with the BT-H mag-dyno upgrade fitted.  He was able to report on his return that they had covered over 1000 miles and the event was excellent.  The Ariel had always started first kick and performed flawlessly the whole of the time.  It attracted quite a lot of interest, especially from the the owners of the bikes that were a little "reluctant" to perform in the sometimes inclement conditions. A picture of the Ariel in Ireland

Customer feedback on B.S.A. Gold Star Fitment

Email, write or telephone to order. 

N.B.  There is a surcharge when paying by credit card.

Mag-Dyno Spares

Note 1.  When you purchase a BT-H mag-dyno conversion the body comes from our small stock of sound, re-machined, S/H mag-dyno bodies.  The appearance of the cases may  vary slightly as the units were part of a production run going back to the '30s.  We do not do an exchange service. 

N.B. We do not supply parts or service the dynamo part of a mag-dyno.

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Copyright © 2008 E. Grew