Upgrading problems

Gude got me a z1000 BJ 03 , had had a slipper with the previous owner and exhaust , dent in the tank and disguise on the ass , abm footrest also warped left side . Have they now built up and I drove before times a lap , has everything worked well has had itself switched butter soft , today tried and more like in the first gear and idle went no more , have then bitsel tried to adjust on the pole without success . What can this be ?????? Had still an oilwe Chsel made since the previous owner 10w60 had made by motorex pure and I now 10w40 motul Would be shit if it were the gearbox at once ??