Honda ATV Forum - View Single Post - 2004 400ex HELP i have air pressure building up in oil tank
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post #2 of (permalink) Old 02-15-2013, 01:35 PM
honda guy 250x
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Join Date: Apr 2010
Location: prentice, WI
Posts: 161
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.

92 honda 250x
99 honda 400ex
400ex upgrades
440 big bore kit
11:1 compression piston
stage 3 hot cam
04 450r carb
P&P head
LRD full system pipe
EHS racing outerwear filter for air box
Kn air filter
4" spal fan
nerf bars
ac front bumper
tech 4 tires
itp rims all the way around
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