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644
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7/3/2018
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Midlands, GB
As the title, I was riding last Monday and all was fine, we had a big storm and my bike was outside at the track for about an hour in heavy rain. After the rain stopped I went to go back out and it wouldn’t start, just cranked over. Eventually it did fire up and I did another session on it.
Got home, washed the bike and now it won’t start again. Just cranks and won’t fire. I have got a good spark, I have fuel and what seems like good fuel pressure. Plug is soaked in fuel after trying to start. Have changed the plug and the battery is fully charged. Shows no error codes on the app.
Bike has done 50 hours, valves in spec and had piston and cam chain 8 hours ago. Has anyone got any ideas? Thanks.
Under the fuel tank there is a connector with a rubber cover over it. Pull the cover off and clean up the connection. Put some dielectric grease on it . It should start. Mine does this probably once a year . Remove bolts in tank, side panels, seat then slide tank back.
Check the kill switch for cracks in plastic and rubber.
Here's what you do:
Hold throttle wide open and crank motor for 10 seconds then stop.
Then push kill switch button for another 10 seconds.
Pull enricher button and start.
This worked for me after having same issue.
If he is getting fuel at good pressure isn't it safe to say the fuel pump connection is good? Unless you are referring to a different connection.
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I had a nearly identical issue on my 23 YZ250FX at 12hrs. I arrive at a race and bike won't start; I had washed it the day beforehand and was running fine prior to that. Spark, fuel pressure, air, compression, and kill switch all tested good. Plug was soaked in fuel when I checked and replaced with a fresh one; still no start and no codes. Ultimately pulled plug, disconnected fuel, cleared the cylinder and let it sit with the plug out and air out overnight in the garage. I'm about 6 hours later now and has been running fine since.
I would try the procedure that Vet57 listed, it can't hurt to try.
Mine was an electrical connection.
Start simple, pull kill switch clean and try, if that doesn’t work, disconnect it and try it again.
keep it dry.
Did you have gas on your plug when/if you pulled it? I'm just trying to find the root cause of my issue and see if it is the same as OP's, as it seemingly flooding out randomly is hard to accept.
I had already put dielectric grease on the fuel pump connector when I got the bike and removed, examined, and reconnected it during troubleshooting but there is a chance water had entered during washing. If water had gotten in my connecter, it most likely would have been ice though as it was 28F at the original time it would not start.
Mine had some fuel on plug, no spark.
Thanks for all the suggestions. Turns out there was water in the ecu plug, although while we were doing it we noticed the rubber boot on the fuel pump plug is really loose fitting, is everyone else’s?
Thanks to my dad for helping, I was ready to throw it off a cliff!
Haha yeah I reckon that would have solved it!
Scrap what I said, it’s back to not starting now. Bring on the cliff!
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