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Old 06-13-2012, 11:27 PM   #1
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Arrow 04 hayabusa

Hey, guys I have a question for y'all...I've been having problems with my bike. I was riding and it shut down on me. I tried to restart it, but it didn't want to start up. So, I checked the battery, but everything was good it was just low, so I charged it and my bike started normally. I started riding it, and again, like 5 minutes later, it shut down and didn't want to start. D y'all think I need to replace the stator???

Thanks.
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Old 06-13-2012, 11:46 PM   #2
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D y'all think I need to replace the stator???

No, this doesn't sound like the starter
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Old 06-14-2012, 12:04 AM   #3
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No the starter. The stator (alternator)
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Old 06-14-2012, 12:31 AM   #4
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yeah thats what it sounds like.
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Old 06-14-2012, 01:27 AM   #5
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Rectifier going out?
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Old 06-14-2012, 01:32 AM   #6
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Do you have a voltmeter? Check the voltage at the battery when it's running and that'll tell you much more than any internet diagnosis.

Could be as simple as a bad battery, how old is it?
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Old 06-14-2012, 07:25 AM   #7
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^what he said. First thing is to the check the easiest part. After you charge it, check it and see if its holding steady. With the bike on it shouldnt drop. If it does, then you know its an issue with the charging system. Before you pull the engine cover off, find the plug coming out of the stator and check to see if there is a voltage output while the bike is running. If not, sounds like you found the issue.
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Old 06-14-2012, 07:42 AM   #8
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Have the battery tested first
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Old 06-14-2012, 08:44 AM   #9
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Quote:
Originally Posted by sullivan View Post
D y'all think I need to replace the stator???

No, this doesn't sound like the starter

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Old 06-14-2012, 08:45 AM   #10
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Test the battery first... then do a key off draw test to see if its a bad rectifier... then crank the bike up and test Voltages at various RPMs to determine if your charging system is working as designed. Shouldn't take long with google to find what those voltages would be...
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Old 06-14-2012, 09:09 AM   #11
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Quote:
Originally Posted by Busa-Rider View Post
Hey, guys I have a question for y'all...I've been having problems with my bike. I was riding and it shut down on me. I tried to restart it, but it didn't want to start up. So, I checked the battery, but everything was good it was just low, so I charged it and my bike started normally. I started riding it, and again, like 5 minutes later, it shut down and didn't want to start. D y'all think I need to replace the stator???

Thanks.
Is battery dead? Does it crank over? Do any lights come on? Need more info was ot dropped?

Sent from my SGH-T959V using Tapatalk 2
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Old 06-14-2012, 01:25 PM   #12
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Old 06-14-2012, 03:49 PM   #13
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Quote:
Originally Posted by Bamtech View Post
Is battery dead? Does it crank over? Do any lights come on? Need more info was ot dropped?

Sent from my SGH-T959V using Tapatalk 2
Battery is good,it hesitates and does not start , all tyhe lights turn on normally
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Old 06-14-2012, 04:00 PM   #14
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Quote:
Originally Posted by Busa-Rider View Post
Battery is good,it hesitates and does not start , all tyhe lights turn on normally
So did you check the charging system while running and for key off current drains?
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Old 06-15-2012, 12:47 AM   #15
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Quote:
Originally Posted by witchdoctor575 View Post
I'm wondering if second post thought (with good reason) that the OP's english was broken and he actually meant starter, or if second post had to go google the word "stator" and will now leave this thread in shame.

Using a multimeter to tell if the charging system is working is easy most of the time.

First do the voltage the battery with the key off. If it's 12-14 volts it's good (though a proper load tester is better). If it's 11-12, it's kind of questionable. Below 11 it probably wont start anything and could be ruined. Then start the bike, and measure the voltage. If it's the same or lower, and dropping steady, there's a charging system problem. If it's higher and holding pretty steady it should be okay enough that you should probably think about other electrical issues.

On cars it's easy to just replace an alternator or a diode.

On bikes, it's annoying.
I don't know if it's true on all bikes, but I know that on my smaller bikes there have been inspection holes on the stator cover. We have a tool at our shop which is a nightvision camera scope. I think they sell a 100$ version at harbor freight. Or if it's easy to pull the cover on your bike, and you have new gaskets or plenty of high temp RTV, do that and look at it. You could use that to look inside your stator cover to see if it looks burnt up inside. Sometimes it's obvious.

attachmentphp?attachmentid279997&ampd1257587606

If it's reasonably cheap to replace your rectifier might as well try it first rather than tear into the engine covers. Some are pretty expensive though.
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Old 06-18-2012, 03:47 PM   #16
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1)Check the voltage of the battery after sitting overnight (12.4 to 12.8v)
2)Check the voltage of the battery while cranking (atleast 11.8v)
3)Check the voltage of the battery while idling and revving it to 4000-5000 or so.. (13.5v-14.4v)

If the battery checks out good but the voltage at idle is NOT in that range, then you need to check the plug at the regulator/rectifier. That plug and its wires are usually melted, therefore not charging the battery. If they are melted, just cut the plug off of both sides and hardwire the wires together to the reg/rect. That will solve it..

If the plug and wires look good, then likely the regulator/rectifier just crapped out...This is pretty common.


You can also unplug the stator connection and measure the voltage of the stator at the plug while idling, it should be around 65vDC at 4000 rpms or so... If you have atleast that, then the stator is good and it tells you the reg/rect is bad.



My guess is the battery has a cell getting weak...It will show good voltage when sitting but under a load (trying to start it) the voltage crashes to 10V...
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Old 06-18-2012, 05:05 PM   #17
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I just had this problem on a costumers Busa I just finished building. Originally I had the motor out and when I put it back in I forgot to tighten the ground cable. Well the result of that was it ended up burning up the rectifier. But the point of all this is after I found the cable was loose it was it was having the same issues discribed. Swapped out the recifier and was good to go.

I have a few at my shop if you wanna test one out. I'm up on the north side.
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