maxum 1900 XR with 150 optimax

[shrew]

My optimax is from 2003.
the max rev is 6000.

Actually according to the specs for the 2003 Optimax 150, both the Optimax and the Optimax Saltwater had a Max. RPM Range of 5,000 - 5,600 RPM's. If you were getting 6,000 RPM's then you were underpropped and over revving the motor. On the other hand, your tach could have been out of calibration.

[robbie83]

you're right !!!
i'm sorry, i thaught it was 6000, but mine is a saltwater 2003 optimax and max RPM is 5750 !!!
That's what it says on the sticker on the engine.

[Mag535]

My local service guy had an used alu 13 1/2 x 23P prop that I could test my 1900Xr/150 hp V6 with. My std prop is a 14,25 x 21p prop. What a disapointment. With my std I do 53mph and close to 6000rpm. With this it did barely 46mph and 5400 and it was almost impossible to trim and get to go straight at full speed. I am trying to find the right setup to get a spare prop and rpm down to 5600 and I will propably now go for the same I got but as SS. Any comments?

Mag

[robbie83]

so, my RPM is : 5350 with the trim @ 8 - 9 ! and the topspeed is 80km/h or 50mph
the prop is a 19p vengeance
The boat will not lift easy, so i have to trim it a LOT, otherwise the speed is also lower...
so i am pretty shure that i have to raise the engine 1 hole more up, or maybe 2 holes !!!
I will post a picture of my engine how high it is hanging at the moment...