400ex Spittin N Sputtern - Honda ATV Forum
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post #1 of 8 (permalink) Old 04-26-2011, 07:13 PM Thread Starter
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400ex Spittin N Sputtern

ok here it is summer time in Alaska again and i want to correct something before i go riding this summer. last summer when ever i would hit a puddle of water more then a few inches deep my 400EX would basically only want to idle, i would be hauling balls and splash thru a puddle and about ten seconds later she starts spitting and sputtering and if you give it any gas she dies. but she will fire right back up...... no water is getting in the air box im sure of that and the spark plug is good and is staying dry the spark wire is good what else could it be im at a loss and with break up almost over there is a ton of water sitting in all the good spots


thanks in advance
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post #2 of 8 (permalink) Old 04-26-2011, 07:36 PM
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I don't know if it's the problem or not, but try putting dielectric grease on all your electrical connections.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

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post #3 of 8 (permalink) Old 04-27-2011, 06:59 AM
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Hmm...maybe you have an exposed wire somewhere that when water hits there, it makes a temporary ground to your frame. Also make sure all your breathers are clear of debris, maybe the water is either plugging one that should not be plugged, or getting sucked up when it shouldnt. There are probably several topics on rerouting your hoses to minimize it taking in water so easily.


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post #4 of 8 (permalink) Old 04-27-2011, 12:42 PM
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The first thing I would do is check and see if you have water in the airbox if you haven’t already. I was cleaning up my quad two days ago and found a 1/4 inch of water in my airbox, I was shocked. Out side of that I would check the carb and clean it out real good. Thats really all I can think of for sputtering unless you took off a mod recently and your jetted to rich.

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post #5 of 8 (permalink) Old 04-27-2011, 01:43 PM
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Quote:
Originally Posted by DAN400ex View Post
The first thing I would do is check and see if you have water in the airbox if you haven’t already. I was cleaning up my quad two days ago and found a 1/4 inch of water in my airbox, I was shocked. Out side of that I would check the carb and clean it out real good. Thats really all I can think of for sputtering unless you took off a mod recently and your jetted to rich.
Yeah, I'm thinking you might be getting water into your carb through the intake tube or something? Look for cracks/holes or something? It gets enough water in there to flood the carb maybe?

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post #6 of 8 (permalink) Old 04-27-2011, 04:19 PM
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I would first follow Helmuts advice. If that does not solve it follow Dan400's advice. I would only do one at a time so I would know what was causing the problem.

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post #7 of 8 (permalink) Old 05-16-2011, 12:55 PM Thread Starter
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ok so after fiddlin with the her for a few hours yesterday i think i have solved the idle only problem.... again reading and scanning and more reading here i think she is flooding because i bog down while in the water and then idle only for a bit and then im off again and yesterday she was back firing almost everytime i would down shift so I think a rejet is in order along with a new exhaust kit but i need on that will hold her under 96dBs any ideas?
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post #8 of 8 (permalink) Old 05-16-2011, 01:19 PM
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HMFs usually break that 96db sound level as do most aftermarket exhausts...If they make a Supertrapp for your bike,it can be quieted down by adding more discs,or it can breathe easier,and be louder by removing discs...You could always buy a stealth add on muffler that goes behind your HMF/FMF/aftermarket muffler that can be put on,or removed fairly easily if you go that route...

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