Build A 12volt Generator

I've heard this will reduce the engine's power output noticeably. Is there truth to this?
 
if the generator puts out the 12 volts or more , it should be able to add juice to the battery. if it puts out less than 12 volts, then no that won't work. and then you would probably need a regulator as well, if it puts out more than 14 volts.
 
i tried a 12 v generator on my bike , the one that fits in the magneto area but it seems like it altered the timing and didnt run well at all ,, i didnt have a load on the generator maybe that was the trouble , anyway i took it off and the bike ran fine again
 
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