motorcycle runs when being hooked up to another battery, but dies as soon as the cables are removed?

Question

bike hasn't been ridden last few years, I've recently charged the battery and still won't run, i boosted it and it runs until i remove cables the backfires and dies

Answer 1

its not getting any juice from the charging system on it,there is a fuse for this,,it is located in under the seat,,check it,,it probably has blown on it,sometimes when you let one set,,it will pop a fuse when you first try to charge the battery back up on it,,i let mine set for two months and it did that,,its not hard to find though,,i own a repair shop,,and we do all kind of work here,,good luck with it,,i hope this, help,s.

Answer 2

The cells in your battery are more than likely dry. Meaning that the acid and water solution has evaporated. Usually motorcycle batteries have three cells and are sealed (or maintenance free). Sealed batteries cannot have more water and acid added to them. It is not recommended to add water or acid to serviceable batteries unless you have been schooled hazardous material handling training and proper safety equipment.

Bottom line: go to any auto parts store, or your local Wal-mart or similar type store and buy a new one. Be sure to look at the CCA (Cold Cranking Amps) number to insure that you buy a power full enough battery to start your engine. The higher the number the better, you cannot buy too big of a battery as long as you have the right case size (battery dimensions) and the replacement battery has proper voltage (6 volts or 12 volts). CCA just means basically how many amps the battery can deliver constantly for 30 seconds at zero (0) degrees F without dropping below a specified cutoff voltage (manufacturer-specific, but usually 10.5 volts). So, the higher number this is the longer you can hold the key switch to crank over the engine until it can run on its own.

New batteries relatively cheep as compared to the common vehicle 6 cell batteries.

Hope this helps you out. Happy Cyclin'!

Answer 3

-Always give year, make, engine size and model # when asking questions. Older bikes with points need a working battery to run.
-When you say "remove the cables", do you mean -
a) remove the jumper cables.
b) Remove the positive & negative leads from the booster battery and re-connect them to the battery in the bike.
-If it's "b", bikes won't run without a battery connected. The battery can be discharged, but it has to be connected for the power from the alternator to run the bike.
-If it's "a", buy a new battery and have your charging system checked, so you don't ruin it.

Answer 4

check the battery. it sounds like you have a bad battery. Its not likely the charging system. The charging system on motorcycles do not put out enough to run the bike with out the battery in good condition. check the battery .

Answer 5

not just the battery... you're not getting power to the spark plugs. If the battery is toast, the Alternator would still produce power to keep it running. It the Alternator is toast, your battery will keep it running until it too dies.

when you connect it to a good battery and it runs, then disconnect the good battery and the motor dies, then the alternator is probably shot, and you need to have the battery tested to see if it is salvageable.

Answer 6

Most bikes call this Alternator thing the STATOR. Need to change that. as your bike is running off the battery, and when you disconnect it, it'll die. That is the sign that the Stator is bad.

Answer 7

Sounds like your battery is shot and you need a new one.

Answer 8

DEPENDS ON THE BIKE COULD BE THE GENERATOR OR THE ALTERNATOR

Answer 9

The alternator is dead.