i have a situation where i feel like my timing has jumped? it bangs out on 3/4 to full revs. happened when putting in hot cam. now stock one was put in at race track sat morning and bangs with it. do you have any advice? rejetted no help plug looks perfect. runs good just no hp on top. even tried my cdi on a perfect running ttr, no banging out. this bike has only 8 hrs on it. started banging at 4 hrs. about timing? who makes an internal rotor for ttr125? we race with street tires on gokart tracks. i want all the hp's i can get.