tachometer pole setting for 50 TRLB

[ruffinit]

Can anyone verify the pole setting for my tach? I have a 2003 Yamaha 50HP TRLB (two stroke). I think the correct pole setting is 6 on my Yamaha analog tach. I know this has been asked before, but a search didn't turn up my particular motor, and I'm not sure my tach is reading correctly. I figured I'd start with the easy stuff first. Thanks for any help.

 

[k4ubr]

Re: tachometer pole setting for 50 TRLB

The Pole Setting Is 6 95-06 Wot Range 4500-5500 Idle In Gear In Water 600

 

[ruffinit]

Re: tachometer pole setting for 50 TRLB

Thanks for the reply.
The reason I ask is.....my owner's manual says 4500-5500@WOT, but I'm only reading 3000 @WOT. I have a 11 3/8 X 12 yamaha prop, and I'm pushing 16 1/2 aluminum deep vee. My speed is 32 mph (gps) with three adults aboard, which is right where I would expect, but I can't believe the 3000 rpm is correct.
Am I missing something here, or is tach questionable? It "seems" right at idle speeds, but I'm new to this, so any advice would be appreciated.

 

[k4ubr]

Re: tachometer pole setting for 50 TRLB

Is It Yamaha Tach? How Does The Boat Run With Just You, You Do Have A Green Wire FoR Signal? on the tach

 

[BaileysBoat]

Re: tachometer pole setting for 50 TRLB

The tach has to be reading wrong.

Assuming 8% slip that prop would give you 5600 rpm at 32 mph, 1.85 ratio.

http://www.rbbi.com/folders/prop/propcalc.htm

I have had a lot of trouble with dirty contacts inside the tach of PRO 50.

I have to spray some electrical cleaner into the tach and work the switches, at least 2x a year.

 

[ruffinit]

Re: tachometer pole setting for 50 TRLB

Thanks again for all the replies. I pulled the tach and it was set to 12P. I set it to 6P. If this essentially doubles my RPM reading at WOT, then all will right with the world. I will run boat again this weekend, and hopefully it will show around 5600. I will repost with results........