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Post by danteperedo on Apr 24, 2017 21:45:48 GMT -6
Hello everybody, it is great to find a forum where we all can exchange information and share our passion for this great bike!
I am about to buy a 1989 bike which is in good general conditions, I just saw it for the first time yesterday and the owner had to connect the bike's battery to his car's battery to start the bike, and had to keep them connected in order for the bike to continue running so I was not able to ride it, but he reved it and it sounded really good and smooth, just like I remember my broter's ride sounded, I mean although I didn't ride it, it sounded rigth.
When he disconnected the battery cable the bike started to stutter a little bit and when we tried to rev it sounded as if fuel was not getting into the carburetors.
It has 29K miles, and the owner told me the battery was replaced no more than six months ago, he actually showed the papers to prove it, the replacement was a Yuasa YUAM2212Y YB12A-A battery.
In your opinion, is it the battery that went bad and I need to replace it?, or it needs proper charging? or could it be something else like the regulator/rectifier?
Thank you very much.
Dante.
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Post by eaglerider on Apr 25, 2017 4:09:08 GMT -6
Possibility that the regulator/rectifier could be weak, not letting the battery charge....or (pray not) one of the magnets in the flywheel has broken, again, not letting the charging system to work right. The broken magnet thing is one of the things that is, regretfully, a problem with these engines. The charging system should be enough current to keep the bike running, even if the battery is not charged up. With the extra battery, did the bike start ok? if it was hard to start, the valves may need to be adjusted, and yes, the carbs could need to be cleaned. Hope this helps.
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Post by danteperedo on Apr 25, 2017 11:10:33 GMT -6
Thank you eaglerider!
The bike started right away, when it was connected to the car's battery, and he had not turned it on before I arrived, I touched the muffler and engine and they were cold!
If I understood you correctly, the charging system should provide enough power to keep the bike running even with a dead battery and without the help of the car's battery?
Like I mentioned in my original post the owner kept the batteries connected all the time we were there, about 40 minutes, and the bike ran perfectly, when he disconnected the car's battery the bike acted like when you disconnect one or two spark plug wires in a car's engine.
Dante
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Post by Blaine on Apr 25, 2017 13:53:13 GMT -6
Sounds like the bike is not charging......You need to hook up a voltmeter to battery & check....Charging bike should show above 13 volts at idle & 14.3 when revved.If the battery is good is should show 12.6 with the bike not running.
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Post by danteperedo on Apr 25, 2017 16:30:01 GMT -6
Thank you Blaine, I will tell this to the owner, because he believes that changing the battery for a new one will do the trick!
I actually called two shops in Tijuana and they gave me the same advice, to take a voltimeter and see if the battery is getting any charge, but they differ in their opinions:
One of them told me that the battery is definetely dead and this is way the bike "stutters" when the jumper cables get disconnected, he said that this bike receives electricity from the battery and battery gets it charge from the alternator, if voltimeter test shows the alternator is charging, than it just a matter of changing the battery, but if the voltimeter test fails then, besides getting a new battery I would need to look at the alternator and/or regulator.
The other mechanic said that just like in a car, most of the electricity for the electric system in the bike should come from the alternator and not from the battery, he tells me to do the alternator test with the owner, and if it fails, he is certain it will, advises me to try to negotiate a lower price with the owner since it is not going to be as simple as changing the battery but a more costly repair.
With whom do you agree?
Thank you everybody.
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Post by Blaine on Apr 25, 2017 17:26:12 GMT -6
Thank you Blaine, I will tell this to the owner, because he believes that changing the battery for a new one will do the trick! I actually called two shops in Tijuana and they gave me the same advice, to take a voltimeter and see if the battery is getting any charge, but they differ in their opinions: One of them told me that the battery is definetely dead and this is way the bike "stutters" when the jumper cables get disconnected, he said that this bike receives electricity from the battery and battery gets it charge from the alternator, if voltimeter test shows the alternator is charging, than it just a matter of changing the battery, but if the voltimeter test fails then, besides getting a new battery I would need to look at the alternator and/or regulator. The other mechanic said that just like in a car, most of the electricity for the electric system in the bike should come from the alternator and not from the battery, he tells me to do the alternator test with the owner, and if it fails, he is certain it will, advises me to try to negotiate a lower price with the owner since it is not going to be as simple as changing the battery but a more costly repair. With whom do you agree? Thank you everybody. The first......That's why I told you what the battery should show with the bike off......If the battery won't hold a 2 amp charge over night than it needs replacing........But you can still check foe bike charging with it running....(14.3) when reved.......If under that that suspect the regulator/rectifier........What you are calling the alternator is actually the Stator. |
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pya977
Junior Member
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Post by pya977 on Apr 26, 2017 13:54:23 GMT -6
help needed
brand new battery, fully charged up and it can hardly turn the starter over any ideas. jumping a car battery and it spins good
the bike battery is yb12a 12,ah
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Post by Blaine on Apr 26, 2017 14:48:25 GMT -6
help needed brand new battery, fully charged up and it can hardly turn the starter over any ideas. jumping a car battery and it spins good the bike battery is yb12a 12,ah Was it charged at 2 amps overnight...If not & was bought charged than it is not fully charged.Also when boosting is the car off.....Are you connecting negative cable right to battery on bike or the frame.....( Trying to eliminate bad ground cable on bike) |
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pya977
Junior Member
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Post by pya977 on Apr 27, 2017 7:55:55 GMT -6
battery was bought uncharged and charged over night plus a day, car battery is off the car but connected with jumpleads onto the bike battery.
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Post by eaglerider on Apr 27, 2017 13:30:10 GMT -6
spins good with jumping tends to make me question the battery. Are you sure the charger you used to charge the battery is good?? Should be a slow "trickle " charge.(just grabbing at straws, here).
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pya977
Junior Member
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Post by pya977 on Apr 27, 2017 14:03:37 GMT -6
yep slow trickle charge charger, tried it again tonight, bike battery nothing but a buss, on with the jump leads spins great and fires up, its almost like the battery is faulty. ive got the battery on charge for the next 24 hrs just to make sure its fully charged fingers crossed
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Post by Blaine on Apr 27, 2017 17:47:40 GMT -6
yep slow trickle charge charger, tried it again tonight, bike battery nothing but a buss, on with the jump leads spins great and fires up, its almost like the battery is faulty. ive got the battery on charge for the next 24 hrs just to make sure its fully charged fingers crossed Check with a voltmeter.....If not 12.6 than the battery is your problem. |
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pya977
Junior Member
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Post by pya977 on Apr 28, 2017 13:58:47 GMT -6
checked battery 12.6v but dipped down to 8.2v when starter is pressed. i have taken battery out to change it and noticed there is no water in it, so i think this could be the problem, its always something obvious
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Post by Blaine on Apr 28, 2017 17:22:01 GMT -6
checked battery 12.6v but dipped down to 8.2v when starter is pressed. i have taken battery out to change it and noticed there is no water in it, so i think this could be the problem, its always something obvious You can try charging it again after you add water.....But this battery may be toast.......So they sold you a empty battery?  ?? |
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Post by eaglerider on Apr 29, 2017 7:04:46 GMT -6
WOW.... Battery must have acid in it....I would take it back where you bought it. Somebody messed up, if that battery was empty!!!!
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pya977
Junior Member
Posts: 300
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Post by pya977 on Apr 29, 2017 14:08:39 GMT -6
filled it up with distilled water put it on charge for 7 hrs and bike started instantly, problem solve, thanks for all your help and ideas.
leason learnt check the obvious things first. trouble with taking it back is my nearest bike shop is 300miles by ferry as i live on an island
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Post by Blaine on Apr 29, 2017 18:15:43 GMT -6
filled it up with distilled water put it on charge for 7 hrs and bike started instantly, problem solve, thanks for all your help and ideas. leason learnt check the obvious things first. trouble with taking it back is my nearest bike shop is 300miles by ferry as i live on an island Sounds like they put the acid in & forgot to top up with water.......Hope it works well for you......Glad to help...That's why we are here.  |
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