they try to keep the voltage steady at 13 - 14.5 V all through the rev range. your altenator is stuffed, or the belt is very loose. but i'd get it fixed by a pro, there's nothing in there you can fix yourself without buying enough tools to pay for the pro's time anyway. doesn't sound like brushes, prolly diodes or regulator.
here's another test ;
lights on, engine off -> lights on, engine on. and are the lights any brighter now ?
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So I bought this old Honda bike, an NSR250. Bit of a street racer, I guess. I'm told they're fast.
Delivering it home with a friend driving the Supra for the first time. I drop gears and make a scream from the twin pipes flowing down this pony's flanks and it takes off like it's tail's on fire.
I look back when the Honda gets to its tap-out and the Supra's only two lengths behind. No one I've let ride my bike has told me its slow, they've all loved the thing. That car is a good thing indeed.
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