K2F mag

Over to you, Taff

It's off a 1958 or 1959-1962 BSA A7 or A10 (42379A or B) K2F anticlockwise rotation. 

The NOC have a magneto man in the technical advice team, named Paul Wolf. Contact him for help on your K2F magneto.

Robert hello again, There is usually another small stamping on the magneto plate with either three or four digits giving the month and year of manufacture. e.g. 364 signifies March 1964 ; 1052 gives October 1952 ; 862 is August 1962 and so on.  Obviously mags tend to move freely between between other types and models of bikes. Bsa, Triumph as well as Norton all utilised counter-clockwise Lucas K2F types.   Until the 18D2 coil ignition Dominators most bikes had black label K2fs then in 1961 they started fitting red label manual advance K2FCs to 88SSs and automatic advance red label K2FCs to the 650SSs.  In 1963 they went back to black label K2Fs for the (newly introduced) Atlas, the 88SS and 650SS. Obviously with a firm like Norton customers could specify certain items to fit especially on the Dominator Specials. So there were many bikes leaving the factory with different magnetos including K2FC, K2FC(WADER), K2FR some with manual control and some with automatic.  I believe some had BTH mags as well.  Cheers, Howard       

So Robert, me again - Here is some further info about your magneto.  My 1960 A7 has a Lucas clip-on pick-up type with the number 42379B from 460.  It is the typical BSA type with a fixed alloy end cover containing the cut-out button.  I also have 42379D on an 88SS from364 with a screw on end cap with a black plastic insert and stud for the cut-out wire. The pick-ups are also clip-on.  Another of my engines has 42379A from 758 and this is a manual advance type with bolt-on pickups and a screw-on end cap.   Hopefully Paul will enlighten us to what the numbers mean.  I doubt if the position of the maximum flux will vary from a BSA, Triumph or Norton but obviously varying the ignition timing with an auto advance unit is different to moving the cam ring manually,  which will move the spark in relation to the maximum flux position.  Ho hum regards, Howard