YZ250FX electric start not working

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4/26/2018 11:16 AM

I've got a 15' YZ250FX and the electric start has suddenly stopped working. Electrical connections and fuses appear to be in good shape, along with the starter motor. The bike has a new battery.

When I hit the start button, the fuel pump will cycle but nothing else happens. No clicks, nothing. The bike is out of gear and pulling in the clutch has no effect.

Any ideas?

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4/26/2018 11:42 AM

Bad starter motor

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4/26/2018 12:09 PM
Edited Date/Time: 4/26/2018 12:15 PM

Check battery voltage under the load of the starter or have it load tested. It should be above 12 volts. There should also be a starter relay mounted by the battery to check. Disconnect the side that goes to the starter and check to see what voltage you have at that connection when you hit the start button. It too should be above 12 volts. Then reconnect and see what voltage you have at the starter wire connection from the relay. It too should be above 12 volts when the button is pushed.

Paw Paw

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5/1/2018 10:25 AM
Edited Date/Time: 5/1/2018 10:26 AM

Paw Paw 271 wrote:

Check battery voltage under the load of the starter or have it load tested. It should be above 12 volts. There should also be ...more

Thanks for the advice. Using a multi meter I am getting 13 volts at the battery. When I disconnect the starter cable from the relay I am not getting any voltage. With the starter cable hooked to the relay, I checked to see if any power was getting to the starter. I am not getting any power at the starter motor.

Any ideas? At one point I was wiggling the starter cable and holding the start button and it briefly turned the starter motor over. I can't find anything wrong with the starter cable.

Also, the relay is new and fuses look fine.

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5/1/2018 11:37 AM
Edited Date/Time: 5/1/2018 11:45 AM

Sounds like a bad relay.
Make sure you are not getting power to the cable running to the starter from the relay with the button pushed.
You can test this also to see if the starter is working by doing a temporary jumper around the relay and see if the starter turns. If the starter turns, then it is a bad relay. Understand that this may not actually start the engine as the fuel pump is also wired through that relay. Also the relay has a fuse mounted on it, if so check it.
If your fuse is bad it will not turn the starter motor.

Paw Paw

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5/2/2018 4:13 PM

Paw Paw 271 wrote:

Sounds like a bad relay.
Make sure you are not getting power to the cable running to the starter from the relay with the ...more

Paw paw,

I believe my relay isn't working. The problem is, I replaced the relay first thing and the problem persists. The fuses are fine.

What would cause a brand new relay not to work? It doesn't click or so anything. My fuel pump cycles and that is it.

I did bypass the relay and the starter motor turns. The cable running from the starter to the relay is fine and not grounding anywhere.

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5/2/2018 4:56 PM

I noticed my neutral switch plug had some dirt in it. I blew it out and reconnected it. It is possible the metal tab is corroded inside the female side. 

 

Would this cause the bike not to start? 

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5/2/2018 6:15 PM

Yes, bad connections will cause these issues. Also the electrical connection on the starter relay ( not the battery cable) can cause the relay not to pull in when the button is pushed. When you push the button it sends 12 volts to the relay via a smaller wire to make the relay pull in and thus makes the connections between the heavier cables and thus the starter turns. The fact that the pump runs when the button is pushed may give an indication of other dirty connections to and from the relay. Check them all.

Paw Paw

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5/5/2018 11:14 AM

Update...

It was a bad starter cut off relay. Switched it out with the radiator fan relay and it fired right up.

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