I just removed a Yamaha 40ELJ from storage, installed a new impeller. and bolted it up to the powerhead. After connecting the shift linkage, I noticed that when the unit is shifted to reverse, the prop is fully engaged and will not spin in either direction, but when the unit is shifted into forward, the prop will not spin counter-clockwise, but will spin clockwise with a clicking noise (all by hand). I don't know if this is abnormal or not, and if it is abnormal, I don't know what might be wrong. I am hesistant to try and run the motor thinking that I might destroy something in the lower unit. Any advice at all on this would be appreciated. Is the prop supposed to spin at all when the unit is in forward or should it be positively engaged in either direction?