Can't get over 3000 revs

[cookie528i]

Hi guys

I have a bayliner Capri with mercruiser 3.0l I/0 and alpha 1 leg 1990

I have not long bought this boat , on the first outing I felt disappointed with the speed and performance then relised that there was emulsified oil in the engine

I stripped the engine down got it skimmed and rebuilt

Now it sound great but I can't get the engine over 3000 revs still , that's with two on the boat just myself I can get it just over 3000 rpm not much though

It will rev high out of gear and I have checked the the carb is fully opened when throttle is down


Any ideas that might get me going a bit quicker


Thanks guys

Steven

 

[Eric 3.7LX Alpha 1]

Re: Can't get over 3000 revs

Hey Steve welcome to Iboats....
at the beginning of this Mercruiser forum, there is a "sticky" link
"Adults Only"

click on it. there is tons of great info there. including a section of troubleshooting:
List of possible causes of low WOT (Wide Open Throttle) rpm

 

[BonairII]

Re: Can't get over 3000 revs

Any motor will rev high on muffs(no load on motor). Check compression first.....then Check spark on all cylinders with spark tester. You've probably got a cyl or 2 not firing.

 

[cookie528i]

Re: Can't get over 3000 revs

Hey Steve welcome to Iboats....
at the beginning of this Mercruiser forum, there is a "sticky" link
"Adults Only"

click on it. there is tons of great info there. including a section of troubleshooting:
List of possible causes of low WOT (Wide Open Throttle) rpm

Thanks Eric. Going to have a look just now

 

[cookie528i]

Re: Can't get over 3000 revs

Any motor will rev high on muffs(no load on motor). Check compression first.....then Check spark on all cylinders with spark tester. You've probably got a cyl or 2 not firing.

Thanks for the reply bonairII Defo Firesign on all cylinders though I will check the compression to see if there is any tell tale signs

The engine sounds sweet

 

[petermarcus]

Re: Can't get over 3000 revs

What kind of prop do you have on it? If the previous owner put a prop on with too high of a pitch, it'll work just great in air with the muffs on, and great out of gear, but will bog down in water in gear.

 

[QC]

Re: Can't get over 3000 revs

Verify the RPM. What speed? Preferably GPS. we can help zero in on this with more info.

 

[NHGuy]

Re: Can't get over 3000 revs

And keep on posting, I love your use of words. Same language, different expressions. Never skimmed a motor or head before today!