my buddy just got an 06 kx250f. he was riding it the other week and he noticed it was squeeling, he looked down and the plug that you take out to line up the crank to time it fell out and leaked out his oil. he brought it back to the kawi dealer and told them he wanted the engine completly disasembled and checked. thankfully the eninge was fine but it could have been alot worse. and i told 2 other of my friends who have 06 kawis that they checked the plug and they were only hand tightened.