Powerdynamo brings new ignition & light 
to your vintage motorcycle

Company

Products

Technical Help

Search

        

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