I have just purchased custom built quad with a fresh KX65 motor (I had it rebuilt completely) with a 70cc big bore cylinder on it. It currently has a Mikuni 28MM carb on it. My question to all my dirt bike friends: Is this carb too big or just right? I also was thinking of switching to a Keihen since all my other jets are Keihen. I has a FMF fatty pipe on it but other wise is a stock motor. Need some direction on what size carb to start with and what initial jetting should I use to get me in the ballpark. The carb on it currently seems real rich & odd? Any help & guidance would be appreciated. Please advise. Thanks.