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Old 04-15-2009, 12:04 AM   #1
GraemePC
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Headlight gets brighter with throttle?

I just noticed tonight when I started up my bike that the headlight was a little dimmer than normal. The light would get brighter as I revved the engine and dimmer as I let off the throttle. After about 5 minutes of riding the light stayed bright.

Is this something I should be worried about? I have never noticed this before but I never really looked for it either. Battery is only 5 months old and the voltage regulator is brand new if that helps at all.
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Old 04-15-2009, 12:05 AM   #2
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Old 04-15-2009, 12:06 AM   #3
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Could be a sign the battery is low OR the stator/rectifyer is going out. Might want to throw it on the trickle charger over night, and keep your phone on you for longer rides.

The F2 is known for these types of issues.
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Old 04-15-2009, 12:15 AM   #4
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Thanks for the info. Hopefully it's nothing, but I'll keep an eye on it just in case. It better not be the rectifier, I replaced that less than 300 miles ago.
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Old 04-15-2009, 07:43 AM   #5
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your idle is probably too low, not allowing enough AC voltage from the stator to be converted to DC at the rectifier.

Check your emission label and adjust your idle accordingly. (approx 1250rpms not 1krpms.)
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Old 04-15-2009, 10:18 AM   #6
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My first thought is rectifier as well.
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Old 04-16-2009, 08:08 PM   #7
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Sounds pretty normal to me. My F2/F3s do that.

I know you said you just replaced the rectifier, but I'd pull off the plug to the rectifier and inspect the plug. Make sure it's not corroded...more importantly that it's not showing signs of excess heat. F2/F3s are known to burn up that plug or the wires going into that plug. Those wires could be keeping your recitifier from getting the 'proper' voltage from the stator.

That's what I'd do.

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Old 04-16-2009, 09:34 PM   #8
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How big of a difference are we talking. Is it noticeably different or you really have to look to see it?
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Old 04-17-2009, 11:42 AM   #9
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Most bikes do that, more so when the battery is on its last leg. When the bike is at idle it doesnt generate as much voltage from the stator/alt as when the revs are up.
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Old 04-18-2009, 09:39 PM   #10
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Its likely fine.

Every bike I have had does this after about 1 year.
The battery just does not hold 100% charge like it did when it was new.
The alternater / electrical system typically does not start producing output until about 1500 RPM.

This is why the light gets brighter, when the engine rev's up a bit.
It then fully charges your battery and the issue goes away, until it sits again.

Typically bikes that sit outside need a new battery every 4 years.

Try not to leave your ignition / light on when the bike is not running, since the battery is now a litte weak.

I have had new batteries do this too.

I have had it happen on cars too.

Just the nature of the beast.

If it gets dim and does not get brighter when the engine rev's up a bit then you have a problem

Well that has been my experiance.
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Old 04-19-2009, 01:40 PM   #11
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its broken. give it to me. it is unfixable
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Old 04-21-2009, 09:33 AM   #12
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Quote:
Originally Posted by 1340HIGH View Post
Its likely fine.

Every bike I have had does this after about 1 year.
The battery just does not hold 100% charge like it did when it was new.
The alternater / electrical system typically does not start producing output until about 1500 RPM.

This is why the light gets brighter, when the engine rev's up a bit.
It then fully charges your battery and the issue goes away, until it sits again.

Typically bikes that sit outside need a new battery every 4 years.

Try not to leave your ignition / light on when the bike is not running, since the battery is now a litte weak.

I have had new batteries do this too.

I have had it happen on cars too.

Just the nature of the beast.

If it gets dim and does not get brighter when the engine rev's up a bit then you have a problem

Well that has been my experiance.
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Old 04-22-2009, 08:15 PM   #13
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i had a car that did that... the headlight also pulsed to the bass beat when the radio was on too, but that's a whole different animal since i was running 2 1000 watt subwoofers.

anyway, i'm not going to pretend i know what i'm talking about with my very limited knowlege of bikes but it sounds like the battery or something related to it. couldn't hurt to get yourself a trickle charger from o reilleys for 15 bucks and leave it on overnight.

then again, i'm one of those people that replaces the cheapest thing first when i cant figure out what the problem is and then goes from there.
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