spuddering help!

[wishin4ahonda15]

My 400ex wont quit spudering. The gas is on and its full on gas. whats the problem?

[mojoe2878]

check the choke position. if thats not it then clean the carb. real good and put a new plug in and see how that helps. 99% of the time that this happens its due to a passage getting blocked in the carb. and or a bad spark plug.

[wishin4ahonda15]

i just had it fully serviced a week ago also

[mojoe2878]

what all did they do to it?
if they replaced the plug then its possible that the ceramic got cracked when it was tightend down and its causing the spark to jump and not be strong at the plug tip like it should be.

[wishin4ahonda15]

well i think it was two weeks ago when they fully serviced it. It was running fine last weekend when i rode it.