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I installed my FCR carb. I got the main jet dialed in but still have a flat spot in the bottom. If it is sitting idling and you nail it wide open it wants to stall. No response. Just like a burp. If I ease it up a little then hit it hard it is fine. I have only ridden up and down my street since the install. I live on a dirt road. It doesn't seem to effect it when riding from what I can see but I would like to get it right. I am running a closed air box slightly modified with a larger intake snorkle. I was running a 150 main in the stock carb with a full HMF system. A 158 seems to be perfect in the FCR. It came with a 170. I went down on the pilot jet from a stock 42 to a 38. It doesn't seem to be any better. I have also had the needle in every position possible. Any ideas would be appreciated. Thanks Frank