im sorry didn't mean to high jack the topic. I was just posting my jettting and mods because we got close to the same mods and figured it might help you. Like a starting point. Every's one motor is different. A weak coil could cause problems in uppper rpm(Know from experince) It'll also richen up the all the jetting. So If the coil is bad remeber to richen it up a little because it will have been leaned out.