Ok. I just bought this bike a few days ago to help a friend. He told me it needed a tune up because it would act up at take off and at higher Rpms. I changed the plugs, and filter is new. I got googling and found on your forum a guy back in May, that was having the exact same problem. His name was Iawoesiwak. After an enormous amount of trial and error he found that the pin holding the reluctor on (engine speed sensor trigger) was worn. He repaced and all is awesome. Can anyone tell me where that reluctor is and how to get to it. I would greatly appreciate it. Thanks.