[torchlake99]

Ok, have a1999 35 Open with cummins 6BTA5.9M3 engines, about 650 hrs on them. Bought the boat late last fall, props on the boat when I picked it up were alter from factory specs of 23x29 3 blade nibral to 23x30. Unknown why they were altered. Running the boat last fall, light load could only get 2700 rpm's, engines plates show rpm's wot should run 3000.

Was advised to send props in and try to get a few more rpm out of them, they now are dialed in to 23x26, this was what was recommended. Over the winter I bought a Cummins manual and read in the manual section on trouble shooting......What I know is we tested the tach on the boat last fall and they were within 1% so not a tach reading problem. This was the 1st thing to look for , number 2 was to check the throttle linkage to make sure it is not misadjusted. Wish I would have had the manual before speeding the time and money on working the props over.

Only time will tell this spring, my concern is with the 23x26 I'm sure the rpm's will run higher and maybe up to 3000 but am I going to be loosing efficiency and performance? In a perfect world I wish a tech would have checked the throttle linkage then if all is well there work on the props.

Any advice? My advice to all that read this is if you do not have an original operation and maintenance manual buy one asap and read it. Most likely will save you a lot of time and money over the years.