BTH TT Magneto KA2-1 model vintage Scott TT Replica or Douglas motorcycles – SOLD

BTH TT Magneto KA2-1 model vintage Scott TT Replica or Douglas motorcycles – SOLD


Off to the USA

BTH TT Magneto KA2-1 model

Probably for vintage Scott TT Replica, maybe Scott Flying Squirrel or some Douglas motorcycles. (possibly 3-1/2hp and 4hp models together with the DT500 / SW500 models)

I bought this, along with another magneto, for an early Douglas 2-3/4hp project. However, it turns out that the 2-3/4 needs an anti-clockwise rotation magneto. This one is clockwise.

I’ve done a little research on K-series BTH motorcycle magnetos. It seems that there isn’t much information out there, so my best guess is that this is for a Scott TT replica somewhere around 1930.

Why? Well it is the taper fit sprocket spindle with a nut on the end. It also clearly states on the original metal label that it is a TT Magneto and the KA2 is a 180 degree / horizontally opposed flat twin model. If you are absolutely certain that you know which model of vintage motorcycle this is for, I would love to hear from you. Every day is a school day for me.

I understand that this model of BTH magneto was superseded by the KD and then KH models.

It sparks when it turns. I cannot guarantee the quality of the spark. I would have been using it if it was suitable for my project.

Overall it is in good, used, condition. No obvious damage or cracks to the magneto. One lead has a small crack in the insulation.

The body has various stamps on it including “E” and “t4”. One of these is probably an inspector’s stamp.

Obviously, the Scotts are 2-stroke, and Douglas are 4-stroke. Having the correct magneto for a 2-stroke machine is important. It’s turning at twice the speed and the components need to be up-to-it. If this is for a Scott TT Replica / Flying Squirrel motorcycle, then some lucky person will get the right magneto for the job.

In summary:

  • BTH TT Magneto KA2-1 model
  • Clockwise rotation
  • Height Base to spindle centre 45mm
  • probably for vintage Scott TT Replica / Flying Squirrel motorbikes or Douglas motorcycles
  • 180 degree 
  • 4 bolt square pattern platform mount (2 inches between centres)
  • works
  • turns nicely
  • Taper type with end bolt (13.1mm (1/2″) down to 11mm (7/16″)
  • has cable operated advance / retard (no cable)


International shipping available. Please ask.

Combined shipping available. 

Viewing: Please come and check it over before you buy. It is at PE28, near St Ives in Cambridgeshire.

Shipping: I usually ship to most destinations. If you don’t see a price, please ask. Thanks. International shipping available.

Collection: If you don’t want it shipped, I have plenty of space. If you can’t collect for a while, it’s not a problem. However, I will need to be paid very soon after the sale. Thanks.

Payment: Good old fashioned money on collection is preferred. I can accept payment through PayPal or by bank transfer as well.

Import Taxes: Please note that IMPORT DUTIES are not something I can control. If you are buying from outside the UK, there is a chance that you will have to pay import taxes. Import taxes vary from country to country. If there are charges to pay, it is the buyer’s responsibility to research the cost and pay the duties. The price that you see on my advert is for the item and not the item plus whatever taxes might be due.

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