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2003 Honda 400ex - Help!


trodge400ex

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i have a 2003 400ex. when i got the atv it had a 40cc big bore kit but i went back stock because it was knocking. i put a new carb with stock jets. when im riding in first gear and and shift and get on the gas the quad wants to bog. it has no low end torqe what so ever. it also has a new plug. idk if it has something to do with the valves or what. idk where else to look.

thanks.

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if yu are still running the stage 2 cam you will need more fuel to get it to run properly ... i would up jet a few sizes and see how that does ... with the stock jets its going to be running lean with that cam and will also run hot and cause it to ware the rings out ..(the rings will get hot and will lose there temper and then not be as stiff and will let it lose compression and then it will start smoking ) burning oil way sooner than it should from normal riding ..i learned that the hard way when i was building and running several different motors in the same 400ex for different races and hill climbs and dirt drags ...i was always useing the same carb .. and needed a different jetting for each motor ..of wich i finally did after wareing out rings several times ..

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