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Battery or regulator? Battery or regulator?
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 1 Jul 2011
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i have now measured the battery and charging. i mesured on the poles of the battery.

the battery is a yuasa- super mf- YTX4L-B3

whit the engine off : 3 volts

whith low rews: 10 volts

whith higher revs: 5-6 volts

so it dropps when i turn the gas roll...

from the engine off to turning the key, before starting engine it altso dropped from 3 volts to under 2 volts...
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  #2  
Old 1 Jul 2011
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You need a new battery. Obviously...

I have seen wierd voltages like that before though. I had 3 dead cells in my battery (43F so different electrics) so it was only putting out around 6V. The regulator wouldn't provide a decent voltage with this battery, I assume because there wasn't enough resistance. So even with the engine running, it was only getting slightly more than battery current.

I would just do the battery first and see what you get. It fixed mine a treat the regulator is working properly now it is feeding the correct load.

If you have a booster pack, you could test it first. Remove the battery and connect the booster to the terminals. Like this:
http://www.bandit127.com/images/Chas...ctrics%20S.jpg
Last edited by Bandit127; 1 Jul 2011 at 19:20.
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  #3  
Old 1 Jul 2011
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I have one of those boosters too.. tho mine doesn't hold charge anymore lol


Vando
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Old 1 Jul 2011
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ok, im buying a new battery tomorrow. i see that my local shop has both normal and gel batteryes. do i need a gel battery.

i have kick start only, but i need some power for my hand warmers
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Old 2 Jul 2011
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well.. hold on!

Are you gonna buy the same size battery as your stock one?!

First you gotta find out if your charging system can actually charge a larger battery than the stock!

Also, the little price difference between normal acid batteries and gel batteries I'd go with a gel battery as there aren't risks of it spilling!


I had a similar problem to yours.
and I explained on my previous post..

The connection was good enough to allow the bike to start but wasn't enough to actually keep the battery charged!

Check, double-check and triple-check every connection!


Vando
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Old 2 Jul 2011
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Quote:
Originally Posted by bikereurope View Post
i have now measured the battery and charging. i mesured on the poles of the battery.

the battery is a yuasa- super mf- YTX4L-B3
<...>
You could get the shop to double check the battery for you before you spend the money on a new one. But since you measured the battery on the poles, I am still sure that they will find it is no good.
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  #7  
Old 2 Jul 2011
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hello again. the battery thats on the bike now is only 3 amp.

wount the charging system handle a 8 amp battery?

will it then not work, or will it only not use the full capasity of the new battery. the 8 amp is the only battery they have for this bike
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Old 2 Jul 2011
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Quote:
Originally Posted by bikereurope View Post
hello again. the battery thats on the bike now is only 3 amp.

wount the charging system handle a 8 amp battery?

will it then not work, or will it only not use the full capasity of the new battery. the 8 amp is the only battery they have for this bike
8 Amp/hours is more like it and probably the right model for the bike.

The charging system should cope as the volts will be the same so the charging current will be the same. You will just have a bigger reserve of amps so it will take longer to charge. Once charged the electrics will use the 8 amp/hour capacity just like it used to use the 3 amp/hour one. It will just last longer.

As Vando says - this assumes all the connections are OK.
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  #9  
Old 2 Jul 2011
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i have now connected the OLD battery to a battery charger. when charging i measured on the poles again and got 12.6 volts right after starting the charging
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Old 2 Jul 2011
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Get a bigger battery and get a gel one for sure. Ofcourse the bike can charge a bigger battery. You have the same volts and the same current. It will take 3 times as long to fully charge a 9Ah than a 3Ah, but you get a "buffer" that 3 times bigger. Its simple

The battery (old one) might not hold a charge, eventhough it looks good coming straight fromt he charger. If you have meassured it with very low voltage It will never be really good again, and it makes the reg/rec work harder. Ditch it.
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  #11  
Old 2 Jul 2011
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went to the store and bought a new battery. the 8 amp was too big to fit so i got a 4 amp gel battery. i used it home and the lights are atleast bright. im charging it now on the new batterycharger i altso bought
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