I've been told my 1994 Force Power Head is bad (50 lbs compression and scoring on #1). The shop wants $3K to put on a new one. I'm a rookie - should I find a used motor somewhere (where?), let them put the new one on, or should I do it myself? I have some mechanic experience - just not on boat motors. Where would I buy a new power head? <br />Thanks,<br />Biplane