Question about 1978 Yamaha XS 650 SE

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My bike just dies

If I want to ride my 650 special i have to charge the battery before i can ride. then it only lasts about an hour before it dies, i just put a new battery in cuz i thought that was the problem but it did nothing. would you think its the alternator?

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Yes your alternator needs to be replaced or rebuilt.Your battery is not getting all the juice to recharge so it drains the battery.

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

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CHARGE BATTERY, THEN START BIKE UP. AFTER RIDING


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.

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Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else. Was the new battery properly charged to begin with? Loose battery connection? I suppose the GPS could be too much but you said that it was dying last november, so I would suspect something else. P.S. you need a properly charged battery to get an accurate reading for the charging test.

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Bad battery


though if it was a problem it would have blown the 10amp fuse????Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else. Was the new battery properly charged to begin with? Loose battery connection? I suppose the GPS could be too much but you said that it was dying last november so I would suspect something else. P.S. you need a properly charged battery to get an accurate reading for the charging test. ,,,

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