[Jetting help!!!] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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Jetting help!!!
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Posted by: acesfull

I have both a 2005 and a 2006 YFZ450. I have exhaust, intake, and jetting on my 05 from Alba. I really liked the way it sounded and performed so I bought it for my 06. I recieved it on Thursday and was going to put it in this weekend but I noticed that they sent me a 150 Kehin Main Jet and it comes stock with a 155 Kehin...does this make any sense? More air means more fuel and a bigger exhaust means faster air leaving the cylinder so a bigger MJ would make sense. But when I called Alba and told them that they sent me the wrong MJ they told me I was wrong they sent the right one (150). I preceded to tell them my side of the story but he flat out said I was wrong and that I would have to call service in the morning to have them explain it to me. Am I wrong? They sent me a 165 Kehin for my 05 and it runs perfect, nice brown color on the new plug. I am going to call tommorrow and tell them that I want a 165 Kehin...should I?

Posted by: Mobile Dyno

They just sent you the wrong jet. I would say 160 or 165 would work...