First time Buying a prop??

[termz]

alright well i was out on the lake when my tilt/trim unit took a crap on me really messed up my prop and need to replace it. i have never had to buy a new prop before so i have really no idea what will fit and what to look for. the prop i have now is a 77348A45P21. If anyone knows a little more about this and can point me in the right dirrection ide appreciate it

I use my boat for wakeboarding if that matters.

1992 force 120 hp H1208X92C C

 

[jerryjerry05]

Re: First time Buying a prop??

The #s They are a part # the P 21 probably means it's a 21pitch prop.
Any other #s on it??
They sell props here on this site.
Also Michigan Prop sells them,I believe if you go to their site and show that # they will help find the right one.
You didn't bend the shaft did you? Hook it up to a set of muffs.Get it running and put it in gear.See if it wobbles?
There should be NO wobble.

 

[termz]

Re: First time Buying a prop??

ive already looked at the lower unit and tested the drive shafts no wobble( man did i get lucky!) im just wondering will my boat be able to pull out a wakeboarder with a 21 pitch prop or should i drop down to like a 17.

 

[tpenfield]

Re: First time Buying a prop??

Here is some info . . . I would not go from a 21 to a 17, but maybe a 19 pitch.

Mercury Marine Black Max #48-77348A45 Aluminum Boat Propeller Application Guide - iboats

 

[roscoe]

Re: First time Buying a prop??

Sooooo, you haven't been wakeboarding with it yet?

Props are selected based on the weight of the hull/size of the motor, and most importantly, the rpm's the engine turns at wide open throttle ( wot ) with your current prop.


Will a 21p prop work?

On a 14' boat, yes. On a 24' boat - no.

 

[tpenfield]

Re: First time Buying a prop??

Will a 21p prop work?

On a 14' boat, yes. On a 24' boat - no.

The standard prop on my 24 foot boat was a 21" pitch. . . . (Quicksilver Mirage 21P)

I put a 4-blade 18" pitch on it for a while . . . it was like driving around in first gear. Definitely could pull up the wake boarders much better though.

 

[jerryjerry05]

Re: First time Buying a prop??

Depending on what your gonna use your boat for???
Just wake boarding,get a prop just for that.
But for regular boating,you need to figure out the rpms at wot.
You damaged the prop but not so bad it can probably be rebuilt.
Send it out and get it fixed.Ask them what the size is??
Then you have the right prop(maybe),if it was the right prop in the first place??
Get the prop fixed,go for a ride and see what the rpm's at wot are???
Your motor should be 5200-5500rpm at wot.
The Force motors were made to go. Driving slow(trolling,fishing)or lugging the motor(pulling wakeboards)etc. Isin't the best for these motors.
I bought my boat new in 88 and started fishing,trolling for Stripers in the Chesapeake.
They carboned up fast. So going slow too much is not good.

 

[termz]

Re: First time Buying a prop??

hey thanks for the info guys, and no i have not been wakboarding with this motor. I had a 115 merc that had bad compression in two cylinders from the rings breaking and it damaged the heads pretty bad and i got this motor for less then it would of cost to fix the other. my merc had a 19 pitch 3 blade on it this one has a 21 pitch but has 5 hp more. i will have to take the boat out and see what it will do at wot with the 21 and ill post results. the 115 merc with the 19p pulled me right out of the water.

 

[jestor68]

Re: First time Buying a prop??

You want a 19 pitch for your Bayliner.

I had a 1992 Bayliner/120 Force exactly like yours.