I purchased a 2010 250r full mod. I was doing a rebuild on the head, and noticed the porting around ihtake valves was grinded to a straight flow to valve dish. I know on previous year crf's have quite a bit of material around guide (not sure about 2010). To me quite a bit of metal and guide were removed. Is this something I should be concerned about. It was a full mod Loretta Lynns bike that placed in top 25. It rips for sure.