rpm

[bassult]

while running around 6300 rpm on a 150 intruder evinrude the motor cut back to 2500 rpm and the motor started smoking. help

 

[rickdb1boat]

Re: rpm

bassult <br />Doesn't sound too good. I'd check the compression first to see what the reading are and that should tell the story. Good Luck,

 

[NathanY]

Re: rpm

I read something on here Joe Reeves wrote, it said something to the effect that some of those engines have a S.L.O.W. system on them, so that if they overheat, the motor will cut power to one bank and that will drop the RPM's down to around 2500. Something to think about.

 

[Joe Reeves]

Re: rpm

Bassult.... Your engine overheated for some reason and apparently the warning horn is either non-operational, or has been removed..... or you ignored it or didn't hear it. Overheating will cause the S.L.O.W. feature to engage which knocks out one bank which in turn drops the rpm to approximately 2500 rpm.<br /><br />That drop in rpm is to warn the operator that something is wrong and to shut the engine down. This feature takes place long before the engine is hot enough to do any damage.<br /><br />However, I agree with Rick that you should take a compression reading. If the engine got hot enough to smoke, I would strongly suspect that bolts have lost their torque and gaskets have failed.