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WR450F 2016 Turns Itself On

30 posts in this topic

Gday all,

Has anyone had issues with their bike turning itself on after riding in the rain? Was riding when it started to rain fairly heavy. Got home, washed it and admittedly put it away wet, went into the garage about an hour later and the ignition is on. Turn it off and 5 seconds later turns itself back on.

Dried all the relays and connectors with compressed air, still doing it. Dried the starter switch same.

Had a quick search and couldn't find anything wondering if anyone has heard of this happening.

Thanks

Steve

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Mine went on when I gave it a heavy washing under the seat to clean it for the Acerbis tank installation. But it only stayed on for a minute then off. You got one of the relays too wet. That relay might be best served zip tied toward the top of the underside of the seat. They also make a cover that goes over the relays. It's in the YZ, WR250 section if you do a search.

Edited by stevethe

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If you ever put the big Acerbis YZ450 on all the electronics can go under the fender seat area which are better protected.

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I will look into a cover of some description. Thanks

I think i have isolated it to the starter switch, when measured with a multimeter it only reads 40-60kohms.

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Hi did you ever find out the exact cause , mine is giving me hell, starts cycling the ignition and priming the fuel pump. Then tonight i was laying in bed and heard my bike start in the shed. It had started itself

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CaveMike have cousin who turn himself on. Problem get so bad no one willing hang out with him. Hopefully bike get fixed or it going end up alone like cousin.

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My mates 2017 wr450f is priming it self and if you push the stop button you can hear relays are clicking on and off. We have tried 2 different stop and start buttons but it is still the same. 

We think its the main starting relay that is under fuel tank and has the red tape on wire.

I'm ordering a new relay today we should be able to try it  this weekend.

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My mates 2017 wr450f is priming it self and if you push the stop button you can hear relays are clicking on and off. We have tried 2 different stop and start buttons but it is still the same. 

We think its the main starting relay that is under fuel tank and has the red tape on wire.

I'm ordering a new relay today we should be able to try it  this weekend.

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Any updates on this?  I have the exact same problem when mine gets wet.  It doesn't actually crank but lights/dash/fuel pump turn on and off constantly.  Eventually it will stop and sometimes it lasts longer than others.  I've also had it go months without doing it, then it will act up one day then be fine for a while.  I also cleaned/dried/dielectric grease every connector but still had the problem after that.

Did the starter relay fix it for good?  I looked at the wiring diagram and couldn't figure out what fault/bad connection would cause this issue.

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Hi folks,just noticed this topic.

I have a 2015 wr250f that has a mind of its own.

Done a wet event March 17 came in to refuel ,pressed kill switch to find bike kept restarting so I panicked and disconnected battery.

This has happened several times since.

Bike has now been fully dried and stored in a dry damp free garage for several weeks.

I have replaced main starter relay next to battery also both relays below battery and both relays on subframe to side of battery.

Also checked start button disconnected it and bike still primes up with clock lights coming on but not starting.

This keeps switching off and re priming immediately.

I believe wiring is same as 450.

Any body able to help please.

Thanks 

Alan 

South Wales UK

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It will be interesting to find out what is causing this issue. I’m sure it will be something so simple,just need to find a way of preventing it from happening once the problem part has been located.

As mentioned it does sound like a short in the starter relay from water Ingress. 

Is this a problem just unique to the WR or are YZ guys having similar issues!

 

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It turned out to be the connector for the starter cut-off relay. It’s not waterproof and was corroded. I made a separate thread on it, 

My problem had gone away for a while but then returned and the bike wouldn’t start at all. I plan to find a waterproof relay connector and a cover for the relay area. 

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55 minutes ago, Qball1982 said:

It will be interesting to find out what is causing this issue. I’m sure it will be something so simple,just need to find a way of preventing it from happening once the problem part has been located.

As mentioned it does sound like a short in the starter relay from water Ingress. 

Is this a problem just unique to the WR or are YZ guys having similar issues!

 

It's mostly water ingress that's the problem.

Waterproofing the electrics or fitting a cover for that area seem to be the best solutions.

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I have a similar problem but its my headlight that stays on after a wash. I can hear the relay clicking on and off with the headlight flicking on and off. Once it dries out all good. Wierd. 

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Headlight is powered by AC current directly form the stator via the regulator, so needs the bike running for it to come on

For it to come on with the bike not running, some sort of short must be occuring

The relay you can hear clicking would be a good candidate to replace first

Sorry can't help any further than that but might give you some ideas to explore

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On 10/29/2017 at 1:53 PM, GuyGraham said:

Headlight is powered by AC current directly form the stator via the regulator, so needs the bike running for it to come on

For it to come on with the bike not running, some sort of short must be occuring

The relay you can hear clicking would be a good candidate to replace first

Sorry can't help any further than that but might give you some ideas to explore

I thought the headlight was DC that's switched via the headlight relay when the bike is running?

I should have a look at the wiring diagram I guess!

Edited by foggy3061

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I think you're right - the headlighr is DC powered through the relay

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