stiff gear selector

[stainless]

Hi all,
I own a susuki 6hp fourstroke, it has been sitting for a few years but after a fuel system service it is now purring lilke a kitten, problem being, the gear selector is very stiff, almost unmovable. can some one give some advice on solving this problem??
Regards
Stainless

[boats.net]

Is it cable or linkages?