I changed my oil today and found a large piece of metal stuck to my oil drain bolt. I have no idea what it is and it measures about 5/8" long by 1/8" wide. Im guessing this is pretty bad even though there is no metal in my oil filter. I also checked my valves and my 3 intakes measured between .011-.012" (not mm) and exhausts were at .010". I shimmed the exhausts to .008" and the intakes to .005-.006", but Im very worried that they were loose. I went from shims 180, 182, 182 to 190, 195, 200 to get them right. I started my bike and it runs fine but I dont feel right about everything. I figured that something was giving me a bad reading so I cranked over to TDC about 5 times each time and shimmed in 3 steps to get to the final pad size. Any ideas? I dont want to blow my bike and kinda want to just put it back the way it was.