Hi, i have a 2007 crf 150r big wheel that is not running right. When the rpm is low andIi go to give it gas it sputters then as it gets into the higher rpms it runs fine. when inspecting the bike I checked the oil and found that it was very high. This is not normal because when I started running it was normal. I do not know if these problems are related or not. The sputtering I thought could be the valves but I do not know. Any help or tips is appreciated.