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Discussion Starter · #1 ·
So I just bought myself a 2008 400ex. Was literally the first night riding it and I experienced a mini heart attack.. had been cruising some trails for a bit then we got on the road and headed back for the house. My buddy next to me lined up and we both hit it. I left his little 250 pretty quick and once I realized I was in my final gear i said screw it and and decided to top it out for the first time... I was nearing the Rev limiter after a pretty long pull so I let off the the throttle and the bike shut off and rolled to a stop. Now I'm not sure if it died before, after or right as I let off the throttle but it all happened quick. I pulled over, inspected the bike, everything looked okay. Tried to start it and it just cranked. Messed with it for a few and then tried turning it to reserve. Tried starting it again, it cranked for a second and then fired up. I cruised back home, opened the gas tank and it appeared to still have fuel? Switched it back to ON and drove it in the field by my house with no issues so idk if switching to reserve is what fixed it or not?? I looked online for like an emergency shut off at top speed or a certain temperature and couldn't find anything. Just wondering why it died out like that. Fires right up today but the incident still has me bugged out. Brand new bike to me ya know? Any ideas of what may have happened are appreciated.
 

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Could just be some dirt at the bottom of the fuel tank.

Did you drain any gas that was in it when you bought it?

If you're running lean, you may need to re-jet the carb.

I'd drain the tank, clean it out, clean the carb.

If you need to re-jet, there are lots of people here who can guide you, and there is lots of info online as well.

GL!
 

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Discussion Starter · #5 ·
Thanks for the info. Bike is a 2008, previous owner seemed to take really good care of it because it is in really nice condition. Didn't drain the tank so idk how old the gas was, I'll ask him when he last cleaned the carbs. He also barely rode it
 

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Welcome to the forums! Bearly riding it is the key here. The carb is mostlikely dirty and a piece of junk got sucked up in the main jet. More than likely just a coincidence with the revers switch thing. I would also suggest if it has done more sitting then riding to run some seafoam in the gas tank with your next full tank. It will clean everything up real well inside the engine and carb. But i would sugges pulling the carb and cleaning it first. The seafoam will help get anything you miss. My .02
 
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