look at it this way my little old 50cc mini moto had 4.5hp and could pull me along at happy speeds of upto 35mph at 14 stone so think of it like this i cant see your alternator taking away 4/5bhp from your engine 1. you can carry it with you hands 2. you can turn it with your hands so looking at it from this point of view. So the whole point of what im trying to get across do you think a little 3kg alternator what can be turned easily by hand power is going to make much strain on a 90/120bhp engine?
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