Battery will not stay charged in the bike - 2002 kawasaki ZX-12R

Not an open wire. What is the charge on the battery. Sounds like maybe the voltage regulator is defective and the battery is draining back through it possibly. Disconnect it or pull the main fuse and see what happens then.

Sounds like the charging system has gone bad. You must have the battery at full charge and test it with a volt meter. test the battery with the bike off. should have 13.6 volt or around there. Start the bike and rev to 2 or 3k and it shold show 14.5. if it doent then the stator is bad.

Sounds like the battery may be either low or shot. Place it on a trickle charger overnite to see if it will take a charge. Once you get the bike to run without needing jumper cables to keep it running, check the charging system. Easiest way to do this is to get a battery voltage reading with a multi meter before starting the bike. After the bike is running, place the meter leads on the battery and work the throttle to get the revs up to about 2000. Meter reading should be somewhere around 13.8 to 14.2 voltsDC. It not close to these readings, you have a charging system problem.

bike will not start or stay running on a full charge battery/bought brand new battery, still same promblem,jump bike off,will crank ,ride bike for 30 min. park bike, leave bike...

You need to check the charging current and also the discharging of the battery in the IDLE mode.
Please check this link for some tips.

http://www.fixya.com/cars/r5824824-draining_car_battery_charge

Use a multimeter to check the charging current and also discharging rate when the engine is switched off.

The alternator and accessories must be checked.

Maybe this will help. This is a common problem that I have had with my GV250. Almost the same bike mechanically by Hyosung.

If the battery is low on charge and you are lucky enough for the bike to start. As per normal when first started it revs higher because the bike is cold, this turns the alternator fast to give you the electricity you need to keep the bikes computer working properly. Bike will warm up and revs drop down, alternater not turning as fast, not as much electricity being made. Bike will either stall or rev up and down irradically to try to produce its own electricity. This will occur when the battery charge is low and bike is at low revs, for example when you slow down for traffic or you stop.

If this is your problem. To resolve it when you are out on the road, keep the revs up, twisting your throttle gently when you are going slow or stopped. Give the bike a good long run on the open road to give the battery some charge from the alternator.

Make sure your battery is maintained. If you dont use your bike for a while it will lose charge just sitting there doing nothing. Give the battery a good deep cycle charge or take the bike for a good long open road ride.

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.

because the bike is so new i wouldnt suspect the stator i would invest in a battery, a good battery is crucial for bikes. once you get a good battery in it check the voltage at the terminals when the bike is running(you should see around 13 to 14 volts). you can have the battery load tested at a batteries plus or an auto part store so you dont waste your money, but once you kill a bike battery there pretty much junk. the stators in motorcycles barely put out enough power to run the bike and pretty much trickle charge the battery. they rely on the battery to pick up the slack. get a battery from walmart there cheap and ive had one in my bike for two years and its fine, stay away from the over priced ones they dont do anything but slim down your wallet.

If the bikes charging system is not working there will be no power to the coils, and no spark (once the battery is drained). Try putting a good, fully charged battery in the bike and check the charging system.

There are certainly several things that could cause the symptoms you describe. Based on the information you have provided that is what I would check first.

get a test light and a schematic. unplug stator plug.start bike ,make sure battery has full charge. test each pin on connector that is attatched to the 3 yellow wires.should light on each pin. if all good check for burn marks around connectors, front & back sides, and on wires. if no power on yellow wires, stator problem. if power, plug connector together, now test for voltage in wires on the voltage regulator side of the connector, to see if the voltage is making it through the connector.if there is power to volt. regulator,test w/ multi meter across battery leads to see if there is charging voltage to battery,approximately 13-15 volts. if only battery voltage(12.2 or less) while bike is running,voltage regulator is no good.if charging good, but bike wont start after prolonged sitting(say overnight) a system amp draw test is needed to see if something is staying powered up while bike is not running, drawing down battery.