My bike will start a run fine with a jump start but when done riding and try to start the next day noy charge. again starts right up and runs perfect. no stall or nothing not sure how to identify which electrical component it is the stator regulator. relay fuse i just dont know. thanks so much

Next time you jump start it make sure the car is off. I was told if its running too much charge will go to your bike. (assuming the car was on)

the battery may seem ok, but it's obviously discharging itself or not charging during riding.

Try this...charge the battery with a battery charger.
disconnect the charger, and put a volt meter on the battery.
Start the bike.
Rev up to 2000 RPM. If the voltage is not HIGHER than it was before starting the bike, there's something wrong with the charging circuit.
If it IS charging, turn the bike off, and disconnect the battery overnight.
If the bike will not start the next day after reconnecting the battery, the battery needs to be replaced.

If the battery is NOT charging at 2000 RPM, the charging circuit is bad, and is likely what is draining the battery overnight.

I'm not sure what electronics your motorcycle has but disconnecting any "modern" electrical system from the battery while running would spell instant death to an alternator and or the computer. I'm going to say that your charging system is working or you wouldn't have been able to ride it "several miles". What I fully expect is that you have a leach (battery draw) which on a motorcycle could be an electronic clock, alarm system, fancy sound system or some other accessory that has been added. Under normal conditions two weeks on a good battery might knock it down enough not to start a quick way to check (not running) is to disconnect the positive lead and hook a digital volt between the positive lead and the positive terminal of the battery the digital volt meter will telly right there if you have a draw. If you don't then I'd be getting that battery checked out cause the short or draw could be in the battery itself. A digital volt multi meter is cheap to buy. In Canada we can get 'em for about $10.00 try it might just isolate the problem

sounds like the problem is your battery is not charging when you are riding. The most common cause is a faulty regulator / rectifier. Contact a motorcycle wreckers for these parts, or your yamaha dealer.
Easy way to test is, when your bike is running, and the lights start to dim, before the bike shuts down, using a volt meter, test the voltage at the battery terminals, should be about 14V. If faulty rectifier,no charge going in to your battery, then the reading will be low, about only a few volts. If you dont have a volt meter, then any mechanic shop can do this test for you. best to have this done before buying any parts.

Yes the brakes will work if the bike does so you can take a breath of relief because there is no brake booster it is just hydraulic pressure from the hand and foot switch. What i think may be happening with this bike is a faulty regulator rectifier. This will cause the battery to die with the key off AND it will also cause the battery not to charge correctly when the bike is running. It may hold a charge but will not charge further. What this unit will do is keep the voltage consistent from the alternator charge.

Sounds like you are not getting a charge from the alternator. You need to check battery voltage with a meter with the engine off, key off. Then again with it running, and the voltage should increase. If not, it's not charging.

It sounds like the battery may be bad in spite of Auto-Zone's pronouncement. The connectors to the battery may be bad enough to make a poor connection to the battery posts. Is the battery water level up to the line in each cell?
Re-jet one step bigger as the baffle removal will make it run lean.

Either you have a dead short in your wireing or your battery is not charging fully. Use a volt meter your battery will have 12 volts start the bike and it should read 13 plus then take it up to 2000 rpm above idle anyway it should read 14 plus. If you dont have these numbers then you have a stator or regulator problem or both. You may be geting a slight charge when running but not enough to keep the battery peaked out.

Ck fuses and wire connections first. If no problem seen, get bike running and disconnect the ground cable @ battery. If bike dies the problem generally is in the stator or regulator assembly not keeping battery charged. Bike will run untill the battery is too low to keep the ignition system energized and the bike will die. If it continues running w/the ground disconnected, the battery could have a dead cell which will drain the battery in a very short time whether it is running or not.

have a voltmeter to check battery ?

place meter on battery terminals without bike running

what voltage ?

then start the bike whats idle voltage and 1200rpm voltage?

Note use the DC setting on meter an follow polarity + red - Neg

doing this will tell you if bike is charging or battery had its day