RPM question

[DoctorCAD]

I have a 10 HP Evinrude Sportwin that supposedly runs at 4500 RPM. How can I verify that it is running at that (or close to that) speed? I have a very difficult time telling if the throttle is wide open and I have no tach. My GPS shows about 9.5 max MPH with 2 people and gear in a Starcraft 15' Kingfisher. Does that sound right? The prop is stock.<br /><br />Thanks

 

[mellowyellow]

Re: RPM question

not 100% sure, but 4500 sounds low... think it's<br />supposed to be 5500rpms? to know for sure, install<br />a tach. reccomend a "tiny tach" for about $35,<br />hooks to one plug wire and ground and keeps engine<br />hrs. too.<br />good luck,<br />M.Y.

 

[Joe Reeves]

Re: RPM question

I don't see a year mentioned on that engine. The top rated rpms on the older OMC engines are 4800 rpm. It changes from year to year.

 

[DoctorCAD]

Re: RPM question

According to the Evinrude site shown here in other threads (it's a german site) the max RPM is 4500.<br /><br />The motor is a 1962/1963 (depends on who looks it up)