i have two motors one of them is just like in the haynes manual, the other is just like it too with the exception of a threaded hole on the left side close to where the sprocket shaft comes out. on my normal motor there is a place where it looks like it could go but no hole, the one with the hole goes into the transmission area and has treads on the inside of it. i bought it already took apart and would like to know if any one knows what it was used for i will probably just put a bolt in it and forget about it.