140 mercruiser wont reach full speed

by Darrell
(oklahoma)

have a 1986 mercruiser inboard starts and idols fine runs to about 1800 rpm and falls out when increased throttle rapidly what is the problem? I can mess with the throttle by moving it back and forth and get it to about 3000 rpm does fine but from 1800 to 3000 wont go is it a carb problem or a fuel pump problem?

Comments for 140 mercruiser wont reach full speed

Average Rating starstarstarstarstar

Click here to add your own comments

Jun 08, 2014
Rating
starstarstarstarstar 		Same problem, lack of speed
by: Anonymous

I had my shift cables adjusted at a repair shop 9 months ago for my Alpha one outdrive on a Mercruiser I/O when it wouldn't go into forward. engine seems to run fine but does not get to full speed, like it needs to shift into a higher gear. Any solutions?
Mar 25, 2010
Rating
starstarstarstarstar 		merc 140
by: dockside marine

The engine has a fuel pump that maintains a constant pressure, so if it was a fuel pump the engine would surge....it really sounds like you need to get a kit and rebuild it...
docksidemarine12@aol.com

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Mercury Forum.