Can anyone tell me what size prop I have, 125 Force

Spivy30

Spivy30

Petty Officer 1st Class
Joined
Jul 19, 2008
Messages
299
Hello,

I have a 1986 125 Force on a 1986 Forester 180 Phantom at WOT i'm only getting 4200 rpms and my speedo says 35 mph with 2 people and a half tank of gas. I want to go to a lower pitch prop so I can get the rpms up but I have no idea what size prop is on there the only markings are "Michigan" and "07 21 07" i'm not sure if the 21 stands for 21pitch any info would be nice.

I would also like to add that I have 150lbs on compression in all 4 cylinders so I dont think the lower rpms are connected to the motor condition.
 
A

a70eliminator

Captain
Joined
Sep 9, 2007
Messages
3,694
Re: Can anyone tell me what size prop I have, 125 Force

Michigan Wheel props have the diameter and pitch stamped into the backside of the hub, you'll have to remove the prop to see it? My michingan prop has some numbers stamped on the outside but I don't know what they designate and possibly that's the numbers your looking at.
 
Spivy30

Spivy30

Petty Officer 1st Class
Joined
Jul 19, 2008
Messages
299
Re: Can anyone tell me what size prop I have, 125 Force

There is nothing stamped on the outside "michigan" and "072107" were stamped on the inside of the hub.

If its a 17pitch prop why would I be getting such low rpms the boat is not very heavy
 
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