I am trying to install a chain on the motor side of this bike. It is the Grubee GT2 in frame fuel tank model. The motor is a Huasheng 142f tapered shaft with 4g. The front sprocket sits at least an inch too far to the left from aligning up with the rear sprocket. The motor is positioned all the way to the right already. Other than changing out to a 4g 12t shaft (longer) does anyone have any suggestions. I know this bike is a couple year old model, but hoping someone has encountered this.