2003 400ex help please!!!!!! - ATVConnection.com ATV Enthusiast Community



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Old 04-16-2014, 06:58 PM
Weekend Warrior
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Default 2003 400ex help please!!!!!!

i have a 2003 Honda 400ex that ive had for a while never had a problem with it until a couple of weeks ago and it started bogging at about 3/4 throttle in every gear the things ive swaped are the carb 2 new different spark plugs new coil new petcock new cdi box ive cleaned and oiled the air filter checked the valves I just don't know what to do anymore please help I really don't want to take it to a professional and spend a lot of money I wanna just try and save money and do it myself the mods on it are .440 big bore kit stage 2 hot cams fmf titanium exhaust and k&n airfilter please help
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Old 05-07-2014, 08:24 AM
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Check compression
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