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Discussion Starter #1
Hello Guyz,

I picked up a Vstar 650 for my father a few months back.

It's a 2001 with around 70k kms on it.

Anyway it had a bad diff when I bought it. Fixed that, new tires and started riding it.

First ride before my father took it over was from North GA to the bottom of Florida.

The bike ran great but somewhere in the South of Atlanta there was a wreck on the highway and I was stuck idling and barely moving for an hour.

After an hour I had moved not even a mile so I pulled over to the side to drink some water and check my phone. Shut the bike off.

When I went to restart it, the battery was dead.

A good samaritan gave me a jump in with his semi truck. After this I rode to an Autozone, let the bike idle in the lot and bought a car battery along with jumper cables. I figured if the stator was on its way out I could rely on this big car battery to get me to Florida.


Anyway to my surprise, with the traffic now gone, the bikes battery charged back up on its own 10 hours later I arrived in South Florida with a fully charged battery.

I read up on here that the culprit could be the little heater elements on the carbs sucking up too much power at idle so the bike being in Florida, I pulled the fuse off and did not put it back on.

I returned the car battery and cable(that I never had to use) and rode the bike down there for a whole week without problem.

My dad then took the bike over (it's his bike) He also rode around on the bike for a few days with my uncle. No problem from the batter. They rode a few hundred miles in Florida without any issues.

He is on his learners, so now he is restriceted to side roads and daylight riding only. He is practicing to get his permit so the other day he went to the DMV's lot where they have painted a course onto the lot for riders to practice low speed manoeuvering.

Anyway he called me and said that after an hour of riding at very low speeds on the course, he stopped the bike for a break and when he went to get back on it. No start.

Same problem I had when I was stuck in traffic for an hour.

He got a jump, rode home. Put the battery on the charger.

Battery now at 12.6v, he says that when he hits the starter button it does not dip below 11v. When the bikle idles her get 13.2v. If he put the bike on chocke, it revs a little faster and he sees 14volts

He and I are both a little puzzled here.

The bike runs flawlessly until you ride it very slowly for a long period of time. Then the battery fades.

He is going to pull the battery from my Vstrom and try to use that one to see if it changes anything.

What could be the source of this problem?

The bike has no accessories, no extra lights and we run without the carb heater fuse installed.

Thanks!
 

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The charging system doesn't charge well at idle. I believe the engine has to be well above idle to keep the battery charged. That's why it would go dead while in long traffic waits and charge up when you got running good.
 

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Discussion Starter #3
So its a design flaw and not a mechanical problem with the bike?

Pretty scary if that is the case.
 

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It would not matter the make of the bike, It has a generator and all generators need rpm's and that depends on size of it.
Your bike needs about 1200rpm just too keep up with stock load. If you have add-on's maybe more.
 

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Discussion Starter #5
I have been riding bikes for 15 years and have owned at least 12 different bikes and never had a bike that would not generate enough current while sitting in traffic.
 

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So its a design flaw and not a mechanical problem with the bike?

Pretty scary if that is the case.
actually voltage isn't what charges a battery i'ts amperage that does that. stator output at max is 233 watts divided by 13volts is around 18 amps barely enough to cover what a 650 electrical system uses. ohms test your stator and i'll bet one output wire is bad so the stator is only putting out 2/3 of it's max rating. the volts can still be 14 but watts or amps won't be enough to keep the battery charged
 

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I agree.....millions of these V Star 650's are and were on the road and this is a very rare complaint on a charging issue....you know it's not a design flaw.....you got some parts that need to be replaced. Do a real electrical test like Pauli says and you'll find the issue.
 

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is it possible that the engine is too hot and the starter has to work too much and the battery is slightly low because of the idle conditions?
 

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is it possible that the engine is too hot and the starter has to work too much and the battery is slightly low because of the idle conditions?
the starter works harder to start cold engines than hot ones, also starting it in gear the starter work's much harder than when in neutral
 

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yes but if the engine is overheated, they get tighter. if the starter is overheated the crank slower.
the only thing in an overheated engine that could bind would be swelled pistons which would score the cylinder walls trashing the engine. so i kinda doubt he overheated it, more than likely the stator has a burned and shorted coil on it. it only takes one bad coil for the stator to lose 1/3 of it's output. i'm coming up on 60,000 miles on 2000 classic 650 and it has never even come close to overheating even on 100 degree days in a traffic jam. engines with overhead cams have very large cylinder heads which disperse heat very well. harleys overheat easy because of the large cylinders and small heads.
 
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