Changing and upgrading the propeller on my Tohatsu 9.8hp outboard

Hello everyone. I took this motor to the water a few weeks back and found out that the max speeds I was able to get was 16mph. Upon inspecting the propeller, I found out that the factory one was the standard of 8.5x7.5. The one I purchased and installed now is a 8.9x8.5 and it should be able to get me to the 20mph mark. If it doesn't then I may need to buy the heavier one, but at least this video shows how to change the propeller and hope it helps you guys.
UPDATE: I sold my Saturn BB290 and purchased a Saturn ZK380 Kaboat, and the speed with the standard prop went out as it should on a motor like this. The BB290 's shape was what held me back.
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[@slacktide_angler]

Nice tip about using a 2x4 or rag to hold the prop in place while you loosen the nut, I wouldn't have thought that. Thank you for the demonstration and looking forward to updated speed test!

[@ErickMartinSucre]

Thank you! I am glad these tips are useful 8-)

[@karniskavva]

Thanks for teaching us! Such value when im buying my first boat in 2 weeks!

[@ErickMartinSucre]

Awesome! I am glad this info is useful to you guys.

[@starofdavid9919]

Hello, greetings from Glasgow Scotland, just got a new Tohatsu 9.8 yesterday, had one i sold with an earlier boat and i kicked myself for letting it go so i treated myself to a new one, they really are fantastic motors, great demo on the prop change very informative.

[@ErickMartinSucre]

Hello from Florida! Thanks for watching and have a great weekend!

[@starofdavid9919]

@@ErickMartinSucre You too pal.

[@ErickMartinSucre]

😉🙂

[@tbo2120]

First day out on the SIB, hit something in the lough and this is the video I need. Exact same engine so it’ll be a wee buns, thanks man!

[@ErickMartinSucre]

My pleasure. Thankfully props are not too expensive for these models.

[@comcroa]

Hello Erick, thank so much for your great videos. This is all new to me and I learn so much because of you :) Cheers!

[@ErickMartinSucre]

I am glad I can be of service 😌

[@mvintrigue-trawlerdiy1101]

Cant wait to see the results.

[@ErickMartinSucre]

Me neither.

[@travisrolando8205]

Another good video my friend! 👍🏻💯 I'm looking forward to seeing the results!

[@ErickMartinSucre]

Thank you kindly 😊

[@randomtechreviews]

Hi! Your old prop seems to have signs of cavitation problem with all that wear. I used the same engine on a takacat inflatable a couple of years ago. It has alot of power but can be tricky to get optimized. Perhaps try cupping the prop and elaborate with the trim angle :) Like your videos and positivism! Have a great day

[@ErickMartinSucre]

Thank you so much! Yeah, I got a heavier prop but I got the same results. I already placed the outboard on FB market place, but still waiting to see what Onlineoutboards will say about this. Maybe it did come with a 8hp carb.

[@spagettiman8310]

Great video Eric I am thinking of doing the same thing with my motor also I have heard of something called a permatrim witch is supposed to help these little motors get on the plane well and stop cavitation

[@ErickMartinSucre]

Thank you! Hydrofoils I think those are called. They help get in place and reduces all of that water splashing around. At the moment since I use lightweight inflatables, I don't think I'll need one.

[@frankmills5284]

@@ErickMartinSucre My first Zodiac(12 ft) with 9.5 Evinrude would ventilate until I put hydrofoil on motor. I think it had something to do with way the bottom of transom was shaped. My current boat(Saturn) doesn't have that problem but I had to put motor a little higher on transom to get best mph.

[@ErickMartinSucre]

Excellent! I appreciate this info.

[@razgriz010]

Another great video 💯

[@ErickMartinSucre]

Thanks 😊

[@greenkeeper448]

I would imagine it it best to be a bit conservative to save some torque for getting back home into a strong headwind also.

[@ErickMartinSucre]

Yup! I was tempted to get the bigger one, but I sometimes have to fight swells and wave and having some torque helps a lot.

[@cohenshcohen]

Good instructive video clips...

[@ErickMartinSucre]

😁😁😁

[@Dogogain]

Great video! Thank you.

[@ErickMartinSucre]

My pleasure 😊

[@fishing8503]

Good video! I have a 9.8 also. Did the new prop make a difference in top speed? Thanks

[@ErickMartinSucre]

The original game me 19mph with hydrofoil on it. That was the 8.5x7.5 one. I put the 8.9x8.5 one on it but have yet tried it with the hydrofoil. I rekon it'll give me about 21mph. I will know once I take it in the water.

[@konradpol]

So your OEM is 7.5 pitch and you wanted to go to 8.5 pitch and have a better hole shot, isnt it the other way around? if you go up in pitch like you are, my understanding is that your RPM's will drop and your overall speed should increase. If you were to go down to a 6.5 as an example it would increase rpm, have better hole shot but lower top end, anyone else agree to that? I would also put an RPM gauge on the engine to see what the OEM prop is giving you.

[@ErickMartinSucre]

More speed is what I want, but it seems it may be my boat's structure that limits my speed.

[@evanspader6762]

The 3 options he talks about references an 8.9 inch diameter but the higher the pitch the more water the blades move

[@ErickMartinSucre]

Correct

[@SNEVIC]

Eric,.......GET INTO THE WATER IMMEDIATELY!!!! lol

[@ErickMartinSucre]

Soon I will

[@ia6980]

Quick qs, so my original propeller is 7.8x8 and the only one that websites have available is 7.7x7 ...how will that affect speed and thrust? Any idea? (There is oem 7.8x7 but i rather get original)

[@ErickMartinSucre]

I don't have experience with the 7.7x7. I assume it may be slower.

[@DragosManciu]

Hello ! How was with the new propeller?Top speed?

[@ErickMartinSucre]

I ended up going back to factory because it bogged down the engine. If I was using smaller or lighter boat, it may have helped.

[@guyak65]

do you have an update on the performance on the 8.9x9.5 Prop?? I am looking into buying the 9.8, trying to get all the info i can...

[@ErickMartinSucre]

Not yet. i have gotten a different inflatable boat and will be trying it again on that model soon.

[@tonib8642]

Hi Eric, I have a Tohatsu 9.8, 8.5x7.5 propeller. Boat and gear weigh 350 kg weight, is it worth it to put 8.5x9 pitch? Greetings from Serbia ⚓⛵

[@ErickMartinSucre]

Ok, an 8.5x9 will be a heavier prop, so there is a chance that it may not get into plane, however, if it does work, you may go faster. I find the factory prop to be more than enough, but that's me personally.

[@tonib8642]

Thanks friend

[@ErickMartinSucre]

Anytime 😊

[@dap5790]

Curious if you looked at any of the 4 blade props?

[@ErickMartinSucre]

I have but since my outboards are small I only need a smaller pitch prop in order to get more thrust. For example, my 6hp Tohatsu has a 7.8x8 prop from factory. By switching to a 7.8x7, I managed to get more thrust and acceleration at the sacrifice of some top speed.

[@ia6980]

Does it needs to be in neutral when swapping props?

[@ErickMartinSucre]

Yeah.

[@JuusoHoo]

thanks, so how was it with the speed change?

[@ErickMartinSucre]

I reverted back to the original. Got about 19.5mph

[@slimnruby]

Use stainless steel counter pin so it doesn't rust out

[@ErickMartinSucre]

👍

[@Mypitbull82]

Hi Eric do you know if there is a prop that can make a Suzuki DF 2.5 hp outboard to make it a bit faster thanks mate 👌

[@ErickMartinSucre]

I am glad you asked. I used to own a 2.3hp Honda, and unfortunately there isn't a way to make it faster. The displacement on those little motors is too small.

[@Mypitbull82]

@@ErickMartinSucre thank u Eric

[@ErickMartinSucre]

Always a pleasure

[@boatsandoutboards9070]

you can install a suzuki Df3.5 carburetor. 3.5 may plane with 140kg/300lbs total weight. (boat+engine+captain+other stuff) if the weight is above that, I wouldn't waste money on a carburetor or a propeller.

[@erictran2187]

I want to ask you what size for split cotter pins??? Thanks 😊

[@ErickMartinSucre]

2.5*25mm and 2.5*40mm both fit

[@ErickMartinSucre]

The 25mm one is the easiest to place and replace.

[@DanBee123]

Do you have a vid with the speed test?

[@ErickMartinSucre]

Yeah, let me get it. I think I got 16mph if I recall

[@ErickMartinSucre]

No, I got 19 mph with this one. kzbin.info/www/bejne/jYnTgKqqr7-HbJo

[@ErickMartinSucre]

Long story short, I had to use a hydrofoil because my ZK380 has a unique shape and it is light which caused porpoising "Front of the boat going up and down".