What Prop on my Yamaha 9.9

[ldaniel1]

What type of prop should I be running on my 2005 Yamaha 9.9 4 stroke. It currently goes 13mph and I’d like to increase the top speed. -Thanks

 

[Texasmark]

The utility prop sold with small engines is for all around performance. 10 hp is only 10 hp. It can't do the work of a 25. Before one could answer your question you need to supply 2 pieces of information......for starters: Engine wide open throttle RPM range...like 4000-5000 type thing and the actual RPM you are currently running when wide open, best trim....position of tilt pin, normal load and distribution within the boat.

 

[Sea Rider]

Funny that new boaters with small portable motors wants to go for a prop maximization without knowing what the current prop achieves. WOT RPM is all, speed is relative...

Happy Boating​

 

[JimS123]

Funny that new boaters with small portable motors wants to go for a prop maximization without knowing what the current prop achieves. WOT RPM is all, speed is relative...

Happy Boating​

We were all new once. Not everyone had Ole or Karl for a father.

 

[Sea Rider]

We were all new once. Not everyone had Ole or Karl for a father.

Touche!! but never occured to anyone from that era to go for a prop maximization right after buying an outboard with factory delivered prop. Compared to, now a days you can count with cheap induction tachs, HP spare parts upgrades, many props to choose from and IBoats to help you figure it out. LOL!!

If the OP wants more power, a matter to check if possible to convert that 9.9 to a 15 HP motor along propping it right...

Happy Boating​

 

[QBhoy]

What is the engine on ?

 

[JimS123]

Touche!! but never occured to anyone from that era to go for a prop maximization right after buying an outboard with factory delivered prop. Compared to, now a days you can count with cheap induction tachs, HP spare parts upgrades, many props to choose from and IBoats to help you figure it out. LOL!!

If the OP wants more power, a matter to check if possible to convert that 9.9 to a 15 HP motor along propping it right...

Happy Boating​

It never occurred to anyone TODAY either....

My friend has a Formula with twin 454's with bravo drives. Every time a new prop design comes out he goes and buys them to see if he can eek out another 0.5 mph so he can be the fastest boat around.

The rest of us that have a 14' tinny with a 9.9 simply want to go fishing or for a boat ride with the family. We're in the 15 mph class and simply want to have fun, not get stressed out to try to maximumize the prop.

When a newby that simply wants more speed, direct him to the prop vs. boat chart, and don't tell him he needs to get tachs and collect data. Some us are boatnuts, the rest are family boaters that don't have the time or ambition to be a scientist.

 

[Sea Rider]

It never occurred to anyone TODAY either....due because instead buying an induction tach boaters prefer to buy boxed beer cans to have fun.

If happy running underpowered tiller motors with a factory delivred prop keep running it that way. All motor manufacturers recommends once the break in period ends to install a prop for the motor to run inside its min-max wot rpm range although max it's preferred as usually loaded, that's to get the max HP cowl rated out of that motor. How do you dial that ? wild guessing wot rpm with plain pseudo musician ear, raisng your finger to the wind ?? Nah, need an Induction Tach for that purpose, do you have personal issues with that ?

It's not the same running a motor with factory delivered prop to go from land to a fishing spot and remain all day there while fishing and sipping cold ones than using same HP motor for long day cruisers to far away distances where fuel consumption $$$ it's a must take in consideration specially if not propped right.

Don't understand why make so darn irrelevant comparissons. What does the OP's 9.9 motor has to do with a formula 454 or your 15 HP motor, to each his own powerplant and fun. Let the OP decide what to do with the information given....

Happy Boating​

 

[JimS123]

What does the OP's 9.9 motor has to do with a formula 454 ....

​

The comparison is a truly simple way to explain the issue. A guy that spends 100 grand on a speedboat probably has the fortitude (and maybe even the technical background) to eek out every last drop of performance. OTOH, a newby with a 10 horse tinny may think that getting all that complicated was a snarky answer.

If the OP googles the Michican Wheel catalog, they have a Prop Selector Tool. Simply fill in the boat and engine type, and it will reply with a selection of props. Easy peasy.

 

[Faztbullet]

All motor manufacturers recommends once the break in period ends to install a prop for the motor to run inside its min-max wot rpm range

Name one.....it not in the Merc/Tohatsu manuals

 

[Sea Rider]

Name one.....it not in the Merc/Tohatsu manuals

Who understands you guys, you can prop right your larger boats and HP motors but give a holy crap about propping right tiller portable motors to get the max out of them. Run your business, I'll ran my own, know pretty well what can be achieved with motors delivered with factory props which usually are medium pitched and not suited for all applications.

NOTE: It is highly recommended that the outboard be checked with a tachometer to ensure that the engine is operating within the correct MAXIMUM RPM RANGE.

Happy Boating​

 

[Sea Rider]

OTOH, a newby with a 10 horse tinny may think that getting all that complicated was a snarky answer. If the OP googles the Michican Wheel catalog, they have a Prop Selector Tool. Simply fill in the boat and engine type, and it will reply with a selection of props. Easy peasy.

Let the OP decide if my post was a snarky answer, if helped, wanting going that route or not. The OP has not mentioned a word about which boat type, length will be powered with his Yam 9.9 which has not been tached as to know if its a good performer or not with current factory delivered prop before pointing him blindly to go for a Prop Selector, PS only works when selecting a starter prop when your motor doesn't count with one, cases seen here, Yeah and easy peasy will need to be water tested, as I assume, I think, probably, theoretical answers don't work here...

Happy Boating
​

 

[JimS123]

Let the OP decide
​

Since he hasn't come back, maybe he already did!

 

[Faztbullet]

I just want to know where in manual/s and which MFG's states after break-in to re prop..
Here is from Merc/Tohatsu manual..

 

[Sea Rider]

Sorry, this post cést fini for me, arguing with you it's counterproductive, you like running large HP motors to have fun with while I love running under powered motors maxed prop to take the max HP cowl rated out of them to have more boating fun than with a factory delivered prop which for my applications renders in being useless. Hope the OP chimes in and states which application type, length plan powering his 9.9 motor with....

Happy Boating​

 

[JimS123]

Sorry, this post cést fini for me, arguing with you it's counterproductive, you like running large HP motors to have fun with while I love running under powered motors maxed prop to take the max HP cowl rated out of them to have more boating fun than with a factory delivered prop which for my applications renders in being useless. Hope the OP chimes in and states which application type, length plan powering his 9.9 motor with....

Happy Boating​

The OP did indeed post the boat specs, and based on his data the pundits here made some excellent recommendations.

Us guys with "big" motors have lots of options. There are 1, 2, 3, 4 and even 5 blades to chose from. Plus countless manufacturers. In many cases we can even dial in the pitch + or - a single inch. Therefore, a tach is a necessity.

OTOH, the little guys have a very limited selection to chose from. When we experienced pilots "optimize" or rigs its all a matter of a compromise. As an example, the kickers on 2 of my boats are most definitely NOT running "maximized". I run the lowest pitch available and they meet my requirements. Knowing the rpm is of no value since there is no factory option to dial it in.

 

[Sea Rider]

This is all the data available : 2005 Yamaha 9.9 4 stroke. It currently goes 13 mph, unless post one with all the missing data flew out of my PC. Under powered motors powering large applications have several 3 and 4 blade pitches to choose from, the old boating era has ended to give way to modernity and efficiency for each one to prop right his application for his complete satisfaction and top water performance, it's a personal choice...

Happy Boating​

 

[Faztbullet]

All I am asking is when you make a statement where did you get this information? No manufactures manual that I own or have digitally say to re-prop after break-in. That like me stating that all manufactures recommend the use of Walmart oil. If you state something have data to back it up.

 

[JimS123]

This is all the data available : 2005 Yamaha 9.9 4 stroke. It currently goes 13 mph, unless post one with all the missing data flew out of my PC. Under powered motors powering large applications have several 3 and 4 blade pitches to choose from, the old boating era has ended to give way to modernity and efficiency for each one to prop right his application for his complete satisfaction and top water performance, it's a personal choice...

Happy Boating​

Quote: I have a 2005 9.9 Yamaha on a 14ft V hull aluminum boat. End quote.

You even replied to him. You must have forgotten. Makes no matter.

I don't have a 9.9 Yami, nor will I ever, but my 2 little guys (Tohatsu Mercs) only have 2 or 3 different props available.

Tomorrow is a boating day so I won't be commiserating any more.