Prop question (basic 101)

[wily]

http://www.yamahapropselector.com/propSelector/web/inner.html
 

that website will help pick the correct prop...I’d go with the 13

cool boat

[MrGiggles]

1 hour ago, Will S. said:

09 Alumacraft MV 1860SPL CC AW 

08 Yamaha F90 Four Stroke

First day on the water since I bought the boat. I have not done a WOT yet because I did not notice the rpms until I was almost back top the dock and that was briefly. By that time I was exhausted from fishing & sunburnt. It is very possible I was trimmed up too much, seriously I was so spent, I just needed to leave. Momentarily read 37mph on my lowrance @ 3/4 throttle and that was about MY limit with my current medical issues. Again im fine at 25ish mph- whatever just be up on plane.

Weather permitting (wind), I plan to go out Monday to better pay attention to my prop position & rpms. Make sure I actually do have an issue before I dive into the prop things. Cant imagine the (original) previous owner would have two incorrect props..

Very possible "exhausted" operator error.

EDIT:  Here is a picture of my gauges when the boat is off. Just noticed where the rpms are sitting. Naturally I dont know if that is suppose to zero out when you shut the motor off. ( I went out to the boat & turned the key on & off but there was no change in tach reading-if that matters.)

 

Could've been blowing out from too much trim, but I think you'd notice that. 

My tach is never zeroed when off. It will go to zero when the key is on until you start the engine.

[Will S.]

8 minutes ago, MrGiggles said:

 

Could've been blowing out from too much trim, but I think you'd notice that. 

My tach is never zeroed when off. It will go to zero when the key is on until you start the engine.

Blowing out is very possible, but like I said it was momentary and I backed off throttle immediately. I will recheck Monday. I did go outside to the boat, put the key in, turned it to on, then turned the key off & removed the key. The tach did not change. Stayed at 1800 rpms.

[Basfis]

On the back of the tach there is a dial to select poles ( I think it’s poles). The contacts that it makes can get flaky over time. If you note where it is set, rotate to stop one way to its stop, then the other to it’s stop, then back to where it was set it should refresh the connection. 
 

 

[Will S.]

2 minutes ago, Basfis said:

On the back of the tach there is a dial to select poles ( I think it’s poles). The contacts that it makes can get flaky over time. If you note where it is set, rotate to stop one way to its stop, then the other to it’s stop, then back to where it was set it should refresh the connection. 
 

 

Well if THIS is the problems, then my rpms are probably fine. I will pull the tach later and check that out. Maybe spray contact cleaner ??  thanks

I will still do the WOT test later as well. Ill keep y'all posted. 

[fishinwrench]

Just FYI, you couldn't get that 4-stroke to 7000 RPM even if you took the prop off of it. 😅 

This thread is rediculous.... even by MY standards. 😎

[Will S.]

21 minutes ago, fishinwrench said:

Just FYI, you couldn't get that 4-stroke to 7000 RPM even if you took the prop off of it. 😅 

This thread is rediculous.... even by MY standards. 😎

Then that is good news. My gauge must be off.

[Will S.]

Rev limiter... duhhhh...

[Basfis]

7 hours ago, Will S. said:

Well if THIS is the problems, then my rpms are probably fine. I will pull the tach later and check that out. Maybe spray contact cleaner ??  thanks

I will still do the WOT test later as well. Ill keep y'all posted. 

You shouldn’t have to pull it. Flashlight and a standard screwdriver are all you need. 

[Will S.]

13 minutes ago, Basfis said:

You shouldn’t have to pull it. Flashlight and a standard screwdriver are all you need. 

It would be alot easier if I were alot younger.. LOL