1912 Bosch DA1V Magneto                                May 2017

DA1V magneto on 1912 racer showing one type of snap type connectors

Firstly for the early Enfield project, this type of open horseshoe magneto was made (I believe) between 1907-1920. The correct angle is 60 degrees, I have a 50 degree version, missing a few bits. Any parts (or a complete mag) would be welcome, but especially the HT lead connections. On this mag type (and I believe on all open horseshoe types), the terminal is a brass ball of 6mm diameter. Onto this a 'snap' type connector clips over the ball, and is screwed or soldered (depending on type) to the HT lead. This is an enlarged detail shot of the high mounted mag on the 1912 racer. The HT connectors look like long black cylinders on the end of the HT leads.

Snap connector 1

Seen on a restored bike, this is a similar connector to the type seen above.

Another view

A view of the business end of the connector.

Original type details                                                June 2017

Original ebonite/bakelite cover with modern homemade internals. The cross hole in the brass receives the brass ball terminal, retained by the piano wire clip.

I've just paid a visit to David, a 76 year old enthusiast who's been into the older end of the spectrum a bit longer than me. He's happily remaking various models of these snap connectors, so I had the chance to examine some original and new copies. David wants to concentrate on his own bikes from now on (one of which is a 2 3/4 RE twin), so armed with a better appreciation of the appearance/build up, I'll now be making a pair for the racer.

Snap connector 2

The standard 1912 road bike came with the correct magneto complete with a different snap connector. This type is a bare brass sleeve, crimped to the outer insulation and soldered on to the copper core. The connection to the ball is by a retained spring clip over a formed hemisphere (to receive the ball). The lower photo shows it clipped in place over the ball, the upper 2 show both 'sides' of the connector. I haven't been able to find either of the 2 types yet, and I'm not aware of anyone making replicas.........unless you know different?

Update - bakelite tube type tracked down as above, and as I have an example of the 2nd type on the model 160, it looks like I'll be making both types from scratch. The model 160 has to have the bare brass type - there isn't enough clearance to the rear chainguard to fit anything else.

Cam ring/advance retard lever

Seen here on a DA1 magneto, this cam ring has an integral advance/retard lever with ebonite knob. The road bike has a series of rods, and a lever mounted on the side of the petrol tank, but the racer/twin tank machine should have a direct mounted lever such as this.

In use in 1912                                                        May 2017

Same lever seen on the 1912 Bert Colver racer.

Girder fork realisation                                            July 2017

I've had the project bike about a full 12 months. Admittedly the model 160 only turned up in January this year, but I've only in the last 2 weeks realised that the fork legs that came with the project bike aren't correct!

So now I've got adverts out there trying to locate a set of fork legs, or a complete set of single spring Enfield forks for the 160. It's highly unlikely that anything will turn up, but you've got to try, I do at least have a set of 3hp/425cc fork legs to trade.

CAP carburettor (AKA BSA)                                   July 2017

Very few old bike nuts will know this. BSA used a carburettor between 1913 and 1923 that consisted of 2 horizontal barrels mounted across a common inlet tract (see photo). The carb is not a BSA design, it was originally designed and patented by a Harold J Cox, and marketed by him as a CAP carburettor. Mid 1912, BSA bought the design, patent and manufacturing rights and stamped a few "piled arms" in conspicuous places.

Bert Colver used a pre BSA CAP carb on the Brooklands racer (it is fitted to the bike in the photo of the racer on the sidecar), and I'd like to fit this type of carb to the 1912 project bike. I severely doubt whether a CAP will still exist, but BSA carbs certainly do. Interestingly, the carb featured an adjustable jet (the adjusting thumbwheel of which can be seen between the 2 horizontal chambers just behind the control cables.

A year and 1 week apart, spot the differences.