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Discussion Starter · #1 ·
Hey guys I just bought my first atv (99 400ex). The idle is a little rough and when I give it throttle it falls completly on it's face at about 1/4 throttle, then it puffs out a little black smoke. It has a Lexx pipe and I was told that the carb was jetted to match the pipe. The motor has a fresh rebuild with around 10hrs of use. It was built by a Honda shop so I have decent cofidence in it. What gives? To me it sounds like it's fludding. The plug is new. Any help would be appriciated
 

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Has it been sitting for any amount of time. It defintely sounds like jetting. Maybe something is clogged.

Welcome to the site.
 

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I agree with Red. The jetting is off or the carb needs cleaned.
 

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Discussion Starter · #4 ·
The guy I bought it from gave me the whole "Humm it never did that before". I can't say for sure if it has sat or not. It's strange throttles to 1/4 just fine then blahh.
 

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Deffinetly not jetted properly.
 
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