2010 crf250 no spark

hondajoe401
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hondajoe401
Edited Date/Time 3/9/2012 12:09pm
when unplug fuel pump there is spark then plug in fuel pump NO SPARK any ideas
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mxtech1
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mxtech1 3/6/2012 12:41pm
3/6/2012 12:41pm
You've got a bad ground somewhere
mx5471
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mx5471 3/6/2012 2:56pm
3/6/2012 2:56pm
I don't think you have a bad ground, but rather a short to ground in the fuel pump wiring, thus acting in the same way your kill switch works. I would get a meter and a schematic, and measure the resistance in the circuit. Find a good ground for the negative probe to hook on to, then check the resistance on each wire at the fuel pump plug. One wire is the ground and should read continuity, but none of the other ones should. Also possible that the pump is shorted internally. Also, you could physically ring out the wiring to the fuel system and check for a bare wire that may have rubbed against something, and wore the insulation in a spot causing it to short to ground. Good luck. The worst problems are the electrical ones. Before replacing any hi dollar components, take a real close look at those wires.
hondajoe401
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hondajoe401 3/6/2012 3:12pm
3/6/2012 3:12pm
THANKS FOR THE HELP have swaped all components with good/ new parts coil ,ecm,stator, reg+.condenser tank from 450 the only thing left is harness AGAIN THANKS FOR THE HELP
mxtech1
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mxtech1 3/7/2012 6:21am
3/7/2012 6:21am
mx5471 wrote:
I don't think you have a bad ground, but rather a short to ground in the fuel pump wiring, thus acting in the same way your...
I don't think you have a bad ground, but rather a short to ground in the fuel pump wiring, thus acting in the same way your kill switch works. I would get a meter and a schematic, and measure the resistance in the circuit. Find a good ground for the negative probe to hook on to, then check the resistance on each wire at the fuel pump plug. One wire is the ground and should read continuity, but none of the other ones should. Also possible that the pump is shorted internally. Also, you could physically ring out the wiring to the fuel system and check for a bare wire that may have rubbed against something, and wore the insulation in a spot causing it to short to ground. Good luck. The worst problems are the electrical ones. Before replacing any hi dollar components, take a real close look at those wires.
Every thing you said summarizes the conditions of a faulty ground. Just like I said.

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flomiester
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flomiester 3/7/2012 4:36pm
3/7/2012 4:36pm
I HAVE HAD PROBLEMS WITH WHERE HONDA GROUNDS THERE HARNESS THROUGH THE RADIATOR BOLT AND COLLAR MOVE THE GROUND TO THAT EXTRA TAB ON THE FRAME AND ALSO RUN AN EXTRA GROUND FROM WHERE THE COIL MOUNTS TO THE FRAME LOCATION mxtech has it right sounds like a bad ground.
hondajoe401
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hondajoe401 3/9/2012 4:34am
3/9/2012 4:34am
THANKS FOR THE IDEAS had to go back and use electrical theroy on this one NOT 1 PERSON I SPOKE WITH EVEN MENTIONED THIS AS A POSSIBLE PROBLEM 20 years experince iv never had a FLY WHEEL LOSE IS MAGNITISIM HALF OF MAGNETS WERE DEAD
mxtech1
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mxtech1 3/9/2012 8:23am
3/9/2012 8:23am
hondajoe401 wrote:
THANKS FOR THE IDEAS had to go back and use electrical theroy on this one NOT 1 PERSON I SPOKE WITH EVEN MENTIONED THIS AS A...
THANKS FOR THE IDEAS had to go back and use electrical theroy on this one NOT 1 PERSON I SPOKE WITH EVEN MENTIONED THIS AS A POSSIBLE PROBLEM 20 years experince iv never had a FLY WHEEL LOSE IS MAGNITISIM HALF OF MAGNETS WERE DEAD
A magnet simply does not just lose it's charge. It takes an equal charge of the opposite polarity to make a magnet neutral again and there's no possible way a motorcycle electrical system could provide this condition. I'm not sure why you would think your magnets are "dead." I would be more inclined to believe the stator pickups are not working properly.
hondajoe401
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hondajoe401 3/9/2012 8:36am
3/9/2012 8:36am Edited Date/Time 3/9/2012 8:40am
DONT KNOW WHAT EXPERINCE YOU GOT MXTECH1 but i fixed the problem it was the FLYWHEEL THAT MEANS NEVER DISCOUNT ANY THING THESE ARE MACHINES THATS WHY I WOOD NEVER HAVE EVEN THOUGHT THAT COULDVE BEEN THE PROBLEM I NO A MAGENET JUST DOESNT LOOSE IS MAGNETISEM THIS IS JUST 1 TOO REMEMBER AND NOT TO OVER LOOK AGAIN
mxtech1
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mxtech1 3/9/2012 12:09pm
3/9/2012 12:09pm
I DON'T HAVE ANY REAL EXPERIENCE I JUST LIKE GUESSING

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