Re: Kawasaki FR691V Alternator Upgrade? ? ? ? ?
Not much if any on going this unlike the Briggs engines. With said it would be experimenting all the way.
The closest engine to the FR691V that has a larger 15A alternator setup is the FS691V. You need at the stator and voltage regulator from one these. Also depending if the flywheel from the FS691V will work on FR691V, possible timing and clearances; the flywheel. If stator does fit on your current engine using the current flywheel will probably have much lower output due magnet size and strength issues but would still produce a higher output than the current setup just not the full output.
Now I am basing these thoughts on what I know about Briggs setups. Like even the same stator is used for the 10, 13, and 16 amp the magnets are of different sizes which affects the output of the Briggs setups. Of course these a few setups that use a different stator for even lower outputs that they use.