302 mercruiser rpm problem!

[72fiberform]

1972 fiberform cabin cruiser 302 mercruiser 2 bbl 188hp 888. My boat feel sluggish and won't plane. First day i took it out it planed out after 5 mins of trying but now it wont.Trim tabs are set still won't plane out. Rpm gauge says 1800 but idk if it's on the money. The boat came with different 3 different props. Think I should try a different prop? Any advice will help. The boat runs perfect starts everytime no problem. Thanks!

 

[thumpar]

Time to work the list.

http://forums.iboats.com/forum/engi...6-list-of-possible-causes-of-low-wot?t=295070

 

[alldodge]

Use the smallest pitch prop you have, but my guess is either the motor is warn out and/or the wrong ratio drive is on it. So after the prop change if not much has changed go thru the list that thumpar posted

 

[thumpar]

The ratio should be 1.5. There was a 1.32 ratio but that was only made for a short period behind the 454 before they figured out it couldn't handle it so I doubt a ratio issue. If it was one of the other ratios it should be overrevving.