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Hey Guys,
My brother and I just picked up a 2000 300ex. The machine seems to run just fine except when we hit any kind of water. When it hits water it runs rough...for a couple snaps of the throttle and then it comes back...In one situation it died after hitting water and we had to re-choke it to start. The water depth does not seem to be a factor...just if it hits the crankcrase...it seems to have this problem. I am not sure exactly where I should be looking for this problem.
Thanks very much
Tom
 

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Remove the seat and take a look at the airbox it sound like the drain maybe stopped up, if your running without the lid on even the tsmallest of puddles will splash up from the rear wheels into the airbox....

Welcome to the forums
 

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Remove the seat and take a look at the airbox it sound like the drain maybe stopped up, if your running without the lid on even the tsmallest of puddles will splash up from the rear wheels into the airbox....

Welcome to the forums
Okay checked the airbox...bone dry in there. Could the sudden change in temp cause this? Are there other know areas where water can get in there? Thanks very much for the reply.
 

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i would check the wiring,maybe your shorting out as for the sudden change in temp i doubt it i take mine through water all the time and never had that issue some of it deep enough to cover the tires
 

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I would check any grounds bolted to the engine. I would also check and make sure the coil is tightened down to the frame tight. I don't know if this is your problem or not, but I once had a 300 utility that would quit when I went through deep water and it turned out to be the bolt that bolted the coil to the frame was loose. I tightened it up and it never did it after that. Again, this might not be your problem, but it would be worth checking as it is easy to check.
 

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That or your getting something wet i would put Die-Electric grease on all the connectors just to be sure.
 

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Good idea^^^^!!
 

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Discussion Starter #9
Thanks for all these suggestions

I will look at all these suggestions. I appreciate the help.
Thanks
Tom
 

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You say it seems to run fine?

Are you sure your not sucking air at the intake boot?
When you splash into water it is causing it to bog or stall?
Also the splash maybe hitting a old dry rotten plug wire.
Make sure your intake boot has a good seal and no cracks.


Take a spray bottle or hose on low with it running and spray a little spot at a time,see if this will show the locating to your problem and allow you to address it.
 
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