I have a 86, lt250r and I’m new to the 2-stroke world. I have couple questions, is there suppose to be a crack along the front of the swing arm, where the swing arm bolt goes through the frame. Will the quadzilla front plastics fit on the front of the lt250r. Is there a big difference between the 85-86, and the 87-89 motors. Sorry for the novel and any info will be well appreciated.