Crank case welding.

[Deefer666]

You can use the late model alternator on an early engine its simply a case of changing the connection, the early alternator will also work on the late engine.... I know the alternator was upgraded but the old one works the on the new bike just fine in my experience, I'm guessing that you would only encounter a problem if you tried to run several accessories from it, like heated grips, heated clothing, sat nav etc all at once.