I am currently restoring a Lucas
MO1L Magdyno and was hoping someone on here could help me with some information about the drive gear equipment.
I believe that the hub (Item A in the diagram, Lucas
Part No. 463121) drives the magneto armature and points assembly by being 'clamped' to the fibre gear by the friction plate (Item C in the diagram, Lucas
Part No. 463112).
This acts like a clutch, with the pressure for the friction drive being applied by the star shaped spring (Item D in the diagram, Lucas
Part No. 463114).
The fibre gear is driven by the dynamo gear, which in turn is driven by the engine timing gear. The drive from the engine is done by various methods of sprockets and gears depending on the bike model.
What I am interested in is the actual magneto armature drive components.
I have bought a brand new fibre gear from Rex's Speedshop but the inside diameter of this gear (where the 463121 drive hub fits), has a slightly smaller inside diameter than the original, so the drive hub will not locate into the fibre gear properly. I can get round this by machining the fibre gear to fit and this is obviously going to have to be absolutely Concentric
with the hub centre and have minimal clearance. I would imagine that the fit would need to be size for size in order for the fibre gear to be absolutely Concentric
with the armature drive shaft?
The inside diameter on the opposite side of the new fibre gear is also slightly smaller than the 463112 friction plate, so I am going to have to do modifications for that too.
I am assuming that, as long as the fibre driving gear is located on the armature drive hub concentrically, the clearance for the friction plate is not so critical?
My original friction plate is in pretty poor condition, so I think I will make a new one. What would be the best material to use? I have access to an abundant stock of stainless steel, but I'm not sure if this is a suitable material?
Would anyone be able to give me any advice on this and also how can I find out (is it possible to?), the actual dimensions of these components? The thickness of the 463112 friction plate is one I would really like to know.
Thanks, Kev E