mike,
This is gsxr's alternator upgrade tutorial:
http://www.peachparts.com/shopforum/showthread.php?t=53238&highlight=143+amp+alternator
'have done the same...acquired used 143 Amp...New Bearings...New Regulator
less than $100.00 invested.
Now, the Rectifier Bridge for this Alt is about $143.00...But I don't forsee
needing one for many miles.