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Boyer Bransden alternative analogue or digital ignition sets
(Through the links "Britbike", "Britcycle" and "Kirby Rowbotham" on this page, you can find information on the digital Boyer set).
Lars Bendsen from Denmark succesfully installed a Boyer Bransden analogue ignition system on his Moto Morini 3½ and Lars has sent me the following information. Boyer Bransden has not got an internet site :-(
1) Boyer Bransden has not (yet) an own website :-(
2) On this page three very interesting links to sites which offer more information :-)
Boyer Bransden produces a system for 90o V-twins. This ignition can be converted into an alternative ignition for a Moto Morini V-twin (with it's 72o angle between the cylinders). The triggerdisc of this 90o set needs to be converted to suit the 72o angle on the Morini. A local workshop made the conversion by producing a new triggerdisc with a lathe and a CNC millingmachine. It should also be possible with a conventional millingmachine with dividinghead with an angual error of 0,01 deg. Apart from this conversion, only a few extra spacers are needed.
According to Boyer Bransden, there is no difference in advance curves in any of their analogue systems, so the processor of the system used by Lars is stamped "Triumph-BSA twin". But a Boyer Bransden, stamped "Norton" would also work, according to Lars.
To use an analogue Boyer Bransden system nn a Moto Morini V-twin the following parts are needed:
Note: the electronic rev. counter of the Morini V-twin needs recalibration with a 500 Ohm trimpot in series with the original. Originally there is one 500 Ohms trimpot so the best way to do it is replacing this component for a 1 kOhm trimpot. (Easier said than done, as the Veglia instrument needs to be opened for this and new, chrome rings to close it again are hard to get).
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