alternator to magneto?

[Kwazai]

This is a question for some of you generator guru's. Is it possible to add magnets to the outside of a alternator housing (located at the coils) and generate a small amount of electricity (firing a spark plug)?

The housing(stator) looks like this--

http://cgi.ebay.com/ebaymotors/Yamaha-XS650-XS-650-Alternator-Stator-Cover-Pickups_W0QQitemZ46280075



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The rotor looks like this--

http://cgi.ebay.com/ebaymotors/YAMAHA-AC-GENERATOR-MAGNETO-STATOR-ROTOR-XS650-HERITAGE_W0QQitemZ4623



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The case cover (aluminum) has enough clearance for about 3/8" thick curved magnet and what I have noticed on the 'magneto' ones(dynamo?(snowmobile)) is that they have magnets rather than field coils.

something like this--

http://cgi.ebay.com/ebaymotors/Yamaha-RD-350-250-DS7-R5-Stator-Alternator-Generator_W0QQitemZ4629917



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except outside the housing.

tia

Mike