xj 900 miss firing help

Hi i have a xj900f its been miss firing . Today i charged the battery. And it run fine .any help thanks

 

Re: xj 900 miss firing

Get a new battery. Need a good battery in these bikes.

 

Re: xj 900 miss firing

It is new

 

Ok i pout a meter on the battery and got a reading of 11.80 v .then i started it and got a reading of 11.65v . So wear do i go frpm here

 

Ok i pout a meter on the battery and got a reading of 11.80 v .then i started it and got a reading of 11.65v . So wear do i go frpm here

 

Your charging system is not functioning properly. Once you got your bike running, you were still running off the battery. When the battery got low, you were basically running out of electricity. Once you put a new battery on, you have lots of electricity but only til you 'run out of electricity' again.

You should have a read of around 14.5+/- volts when the engine is running. I'd first suspect the rectifier/regulator. Normally when they go bad, you have run-away electricity and you start frying things and blowing fuses. But they can go bad and have not enough power getting through, too. Do a search to find out how to test the stator and alternator to see if it is putting out enough juice, too. If there's not enough there, then the regulator doesn't have anything to regulate. If there is enough there, and it's not going through the regulator, then you know where the problem is.

Now, one thing to check........look at the wires that come out of the alternator and/or stator and check the other ends to make sure that you don't have a case of 'a clip simply came apart" . that would be nice, but unlikely. Possible, though!

Keep us posted on what you find........

Dave

 

Ok will do .and thanks

 

When you tested the charge rate was the bike at idle? bike wont charge the battery until about 2000 revs.

 

http://www.electrosport.com/technical-r ... iagram.pdf

Alternator brushes may also be suspect

 

Ok i noticed to day that the 3 white wiers are geting hot very hot .when i disconnect them. the bike runs much better .with them disconnected and a full batery it runs beter then it has befor .

 

Ok i noticed to day that the 3 white wiers are geting hot very hot .when i disconnect them. the bike runs much better .with them disconnected and a full batery it runs beter then it has befor .

 

the three white wires are from your alternator each represents a phase, check the multi plug to ensure they are not melting the plastic. a few people have had problems in the past with melting terminals? sounds like the reg/ rectifier unit could be fried, as hogfiddles has said output at 2000 + revs should be 14.5 V

 

My 900 became very erratic last year.

I wound-up replacing the Ignition Switch and getting a pair of Dyna's to replace my Coils.

 

Out put is 11.85 all the time .and if i hed not discnnected them they wood heve melted . So is it my reg \rectifier? Can i put a meter on the 3white wiers .if so what reading soud i get

 

I posted a fault finding diagram. If you follow it you can't go wrong. Its getting hot because you have bad connections. Pull them all and clean them!

 

When an overheating issue presents itself, ... disconnect the Voltage Regulator from the Wiring Harness.

Inspect the Quick-connect Plug to the Harness.

Overheating often Melts the Plug-in near the RED Wire.

The RED Wire heats and sometimes causes the adjacent Wire Terminals to escape their securing points, ... allowing for the :: Terminals :: to separate even though the Plug-in remains connected.