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Discussion Starter #1
My stock YTZ10S (8.6Ah) from '05 RR is getting worse during hot starting. Someone has given me a new Yuasa YTX7A-BS which is fit to the battery compartment but the capacity is only 6Ah. Does anyone know what the negative impact is to the bike especially ECU or some other electrical component? It is about 30% lesser than factory recommendation. Has anyone tried this out before? Thanks in advance for sharing.
 

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Nothing dagerous.. but you'll likely kill the battery faster and it wont have the same power. It's kinda like getting one that's already half dead.

Here's what you need:

Battery Family: YTZ Factory Activated, Maintenance Free
Battery Type: YTZ10S
Voltage: 12
Capacity: 8.6
Dimensions: 6" x 3 7/16" x 3 11/16"
Weight: 7.0 lbs.
Metric Dimensions: 150mm x 87mm x 93mm
Metric Weight: 3.2 kg
Polarity:

Acid Volume: N/A
Amps: 0.9
C.C.A.: 190
 

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Discussion Starter #3
Thank you and I know that I am supposed to use YTZ10S. But it is quite expensive.

Nothing dagerous.. but you'll likely kill the battery faster and it wont have the same power. It's kinda like getting one that's already half dead.

Here's what you need:

Battery Family: YTZ Factory Activated, Maintenance Free
Battery Type: YTZ10S
Voltage: 12
Capacity: 8.6
Dimensions: 6" x 3 7/16" x 3 11/16"
Weight: 7.0 lbs.
Metric Dimensions: 150mm x 87mm x 93mm
Metric Weight: 3.2 kg
Polarity:

Acid Volume: N/A
Amps: 0.9
C.C.A.: 190
 

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this sounds crazy bc i hate yamaha ...but my friend works at at honda yamaha dealer and if u get a battery out of a Raptor 350 its the same battery just make buy yamaha but its alot cheaper....
hope that helps...
 
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it doesn't matter what it's capacity is, if it's 12v it'll work with no ill effects on anything electrical.

however, it's kind of interesting when you say it's not starting well under hot weather. you don't by chance have a 2003 or 2004 do you? Are you interested in finding out why it's not before you throw parts at it so you don't have to by expensive batteries every year?
 

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Discussion Starter #6
I have a '05RR and measured the charging before and it is ok. When I mentioned about hot starting issue, it is actually cranking slowly until speedometer clock reset when engine temperature close to more than 90 degree celcius. It is like riding for 15 mins and stop at a shop for shopping for 2 minutes. It ended up cannot crank or crank weakly. But if leave the bike for 1 ~2 hours to cool down. It cranks like brand new battery. This issue has been discussed in the forum for so long and even happen in '06 RR. The only solution seems to be replacing faulty battery.

FYI, I have a Ctek battery charger but it didn't help on hot starting but improve a lot if I store the bike for more than 2 weeks. You have any idea for my problem?

it doesn't matter what it's capacity is, if it's 12v it'll work with no ill effects on anything electrical.

however, it's kind of interesting when you say it's not starting well under hot weather. you don't by chance have a 2003 or 2004 do you? Are you interested in finding out why it's not before you throw parts at it so you don't have to by expensive batteries every year?
 
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the reason i ask is because of thermal expansion. when it's hot, something might not be contacting like it's supposed to... like the starter grounding.

you're sure the battery is toast though... you've had it draw tested and the whole 9 yards...
 

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Have you charged the battery with a 1amp trickle charger? Usually that will resolve the problem unless the battery cells are damaged.

My '04 was having the hot start problems even 6 months after I got it. It has to do with the poor location of the R/R and a very demanding electrical system. After 3 years of trickle charging the battery it finally died on me last week.

If you do have a trickle charger try charging it first. You will need it for your new battery if you wind up having to buy one anyway. Make sure you get a charger with a built in regulator or it says on the label that it won't hurt to leave it on overnight.
 
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The 6Ah battery has lower cranking amps. It will make your problem worse.

Buy a new ytz10s and heat shield the battery compartment.
um, unless the max draw the battery can deliver is less than 10 Amps... he's not going to have a problem... at all.
 

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um, unless the max draw the battery can deliver is less than 10 Amps... he's not going to have a problem... at all.
Actually more than 10amps is drawn during cranking. Ampere hour rating of the battery represents the capacity, not the maximum allowable current draw. The 8.6 Ah rating of the YTZ10S simply means the battery can substain a constant draw of 8.6A for an hour, or 17A for about half hour.

CCA or cold cranking ampere is a measure of max amperage that can be drawn at a given temp. YTZ10S has a rating of 190, where the YTX7A-BS has only 90CCA
 
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Actually more than 10amps is drawn during cranking. Ampere hour rating of the battery represents the capacity, not the maximum allowable current draw. The 8.6 Ah rating of the YTZ10S simply means the battery can substain a constant draw of 8.6A for an hour, or 17A for about half hour.

CCA or cold cranking ampere is a measure of max amperage that can be drawn at a given temp. YTZ10S has a rating of 190, where the YTX7A-BS has less only 90CCA
i understand all that. thank you. he wont have problems.
 

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The battery being so close to the mid pipe and all, i figured that cannot be good for the battery. Hence I did the shielding on my 03. With the 07, honda has already done it.:toothy4:
They also gave the +05 models a high torque starter and moved the R/R on the +07 models. I've never really noticed my battery getting hot. Probably not a bad idea to add some heat shielding anyway.
 

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If the bike was meant to have a YTX7-BS, it would have come with one. One YTZ10 costs less than buying YTX7's over and over...and over. Sure, it might not cause damage, but it could. Long term undervoltages can cause component failures too. Rocketscience is right...but you should follow Knightsluggers advice and find the source of the problem. Oh, and I am a Honda Service Pro certified tech.
 
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If the bike was meant to have a YTX7-BS, it would have come with one. One YTZ10 costs less than buying YTX7's over and over...and over. Sure, it might not cause damage, but it could. Long term undervoltages can cause component failures too. Rocketscience is right...but you should follow Knightsluggers advice and find the source of the problem. Oh, and I am a Honda Service Pro certified tech.
i wonder where the big ass YTZ10S battery is on the AMA Supersport bikes.

oh yeah. they dont have a high capacity battery... it's like a 1Ah battery.
 
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