I have a 85 searay seville with a 140 merc I/O. I am currently looking for a way to improve my r.p.m.s. right now I run a 21p prop. for more top speed, but my motor will run above 4000 rpms with this prop. I have a 19 & 17 p. props as well. but they really take away from top speed. i would...
