I'd remove it because after a few years of no use, the rubber parts in it will have dried out and hardened, lubrication in the motor will have settled, allowing corrosion in the motor, and all you'll have is a useless piece of junk that leaks.. You can prob'ly get a few $$ for it now from someone who plans to do some offshore sailing where he can use it.
Btw, I see you've joined sbo.com less than 2 weeks ago..welcome aboard!
--Peggie