2004 400ex HELP i have air pressure building up in oil tank - Honda ATV Forum
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post #1 of 15 (permalink) Old 02-12-2013, 11:52 AM Thread Starter
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2004 400ex HELP i have air pressure building up in oil tank

there is a lot of pressure building up in my oil tank (enough to blow dipstick out when unthreading to check the oil) I checked the oil lines to and from tank for a clog but both seem to flow. anyone have this problem or have any advice what may be causing this thanks if it helps I just rebuilt the motor has about 1hr run time on it then it started to smell hot soi shut it off to check oil and that's when I noticed problem(I have rebuilt a hand full of these motors now and this is first time having this problem)
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post #2 of 15 (permalink) Old 02-15-2013, 01:35 PM
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I would check the oil filter and check the screen filter in the oil tank there has to be a blockage somewhere. also check the crankcase breather make sure that's not plugged.

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post #3 of 15 (permalink) Old 02-15-2013, 11:09 PM
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X2 what 250x posted ^^ there...

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post #4 of 15 (permalink) Old 05-13-2019, 05:53 PM
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Im having the same problem here on my 1999 honda 400ex when i check the oil it comes pouring out on me like it is building pressure up please help me out
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post #5 of 15 (permalink) Old 05-13-2019, 06:12 PM
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How much oil did you put in? This engine is very hard to check the oil and fill it properly. If you fill it full when sittingf it will be way over filled. Should be less then 2 quarts in it. If you have the proper amount of oil in it i would start by removing the screen in the oil tank lower line connector. The line unscrews and then the whole compression fitting unscrews from the tank. There is a fine screen that if it was clogged could back up oil in the tank. The proper way to check oil in this quad is start it and let it idle till its most of the way warmed up. 10 to 15 minutes if its warm out. Could take 25 or 30 when its cold. Then without hitting the throttle the whole time its idling you shut it off pull the dip stick wipe it off and put it in without screwing it into the threads. If you do it any other way the reading will be wrong. This system has to scavange oil from the tank so when sitting over night the oil levels will balance between the engine and tank. This is why reading it this way will be wrong. Welcome to the forums!
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post #6 of 15 (permalink) Old 05-13-2019, 07:09 PM
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i just got the 400 ex and i never put oil in it because the guy i got it from said he just checked it and it was fine but he also told me that motor had just been rebuilt top end and timing chain kit put in and its only been about a week since i got it but last week i checked the oil and it was like new then 1 week later checked it again and that is when it came pouring out and was dirty as ever and smells like gas a little bit so i am lost lol
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post #7 of 15 (permalink) Old 05-13-2019, 07:43 PM
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Yikes. That sounds like you got a float sticking in the carb. What ever you do dont run it like that. The fuel will leak into the combustion chamber through the valves and clean off the carbon buildup and dirty the oil real quick. Which also explains why its way over full aswell. Most of the time when the floats sticking it will leak out the over flow tube out the bottom but i have seen them get clogged with mud and cause the fuel to find the next path and thats directly into the engine.

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post #8 of 15 (permalink) Old 05-13-2019, 08:28 PM
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so I have a new carb but its jetted up and makes the bike run hard so i do not know what i should do i guess clean the carb right ?
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post #9 of 15 (permalink) Old 05-14-2019, 09:31 AM
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Yes, clean the jets out and make sure your needle and seat isnít sticking, I would order a carb rebuild kit. Comes with everything you need


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post #10 of 15 (permalink) Old 05-14-2019, 05:03 PM
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The crank case vent should be releasing the air pressure. Is it clogged?


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