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3" alternator to replace Lucas E3L type dynamos

71 98 499 15 for BSA Twin

price and availability


parts supplied


adapter plate not supplied but available

Essential properties:
  • 12V/75W output, negative ground (Will be destroyed if subjected to positive ground!)
  • may be used for left and for right turn
  • integrated solid state regulator/rectifier
  • may be used without battery,
    requires than however smoothing condenser (see info)
    NOTE: output at start is not enough to make battery based ignition work without battery. Without battery only if bike has magneto based ignition!
  • no internal gears, carbons or other parts subjected to wear and tear
Physical data

  • sturdy plated steel body with alloy end caps
  • diameter: 76mm
  • length of body: 150mm 
  • takes original back plate (if slightly modified, see instructions) or our replacement backplate 
    part 71 98 499 001 BSA
  • threading at shaft end for tapered version is (differing to original) M8x1 (nut suppplied)
  • for overall dimensions see drawing here 
  • weight: 2.3kg
  • fixed red plus wire of ca 1m length (to be cut as needed)
Electric data

  • 12V/75W (at 8000 shaft revs which is about 6000 engine speed)
ca. engine
revs		 shaft
revs		 ca.
watt
1.000 1.400 20
1.500 2.000 40
3.000 4.000 60
6.000 8.000 75
  • negative ground only (will be destroyed if placed on positive ground!)
  • integrated solid state rectifier/regulator converts the generated alternation current into direct current and stabilises it at 14.4V (the norm in 12V systems)
  • if used without battery you need to install a smoothing condenser in place of the battery to get full output.
Instructions
Photos
for other makes see