how hard would it be to pull the cable from the sheathing in order to clean it and then reinstall into sheathing? im thinking that it might be gunked up. and it seems original to boat wich is 74
you can't remove the cable from the sheathing.
. There is a good chance the cable has frayed or the inner sheathing has failed.
disconnect from motor
AND the helm.
does wheel now turn easily? if not, replace the helm.
does cable move freely?
If not, the cable is bound up inside -- replace it
Does motor turn easily when you push on it with one hand?
If not, the king pin on the motor is bound up with old hard grease and or corrosion. clean it out and grease it up.
The length of the cable, or the little bend at the splash well, is not causing the issue.