with the new found torque, you can install a 12 or 13 pitch prop and get significantly more top speed out of that motor now.. Probably closer to 28-29 mph
There is no need for a new ECU, I did this same conversion and by the advice of a Suzuki tech he said the stock ECU would adjust to the added airflow and it did, runs great. Only parts you need are the flame arrestor on seal
@@kitkat101 No issues, I've been checking the spark plugs and they look good, no signs of running too rich or too lean so the ECU is doing it's job. You will need a new prop tho, I got an 11 pitch, the stock prop on these are horrible anyways so budget for a prop as well
Man! Your video was awesome thank you. I’m soon to get the Suzuki 9.9 2022 4 stroke short shaft. Thank you for sharing that. If I ever have the need to up it to 15hp or 20. I now know how to do it. So amazing again thank you. Your video was super informative. Great job.
We used to do that with a 6hp Mercury cover on a 15hp Mercury, just to fool the police, my little Zodiac Cadet 310 used to go over 50kph with that 15hp Mercury, the whole boat and motor combination weighed like 90kg with a full 24 liter tank.
@@Dark30Outdoors Try putting the original control module in and test the speed and acceleration just by removing the air restrictor. ? ? ? Will it run a little bit better or a little worse or alot worse?.
Hi there, I have since been told the ecu does restrict the rev limit. The 9.9 revs to 5800 the 15 to 6000 and the 20 to 6200 that's how some of restriction works
9.9hp engines are tailor made for specific markets and regulatory rules. like in the EU the maximum engines kids under 16 can use is a 9.9hp engine. Easier to downgrade an existing engine design to meet the hp requirement than making a whole new engine.
Looking to do this to a Mercury 9.9 EFI. The parts seems to be the same between the 9.9/15/20 EFIs, except for the ECUs and restrictors on the 9.9/15. Hope it'll be this easy for me.
@@Dark30Outdoors Yep, it was very similar, and worked. The ECU was a little harder as I had to remove the lower cowling a bit since the electric starter take up some room above the ECU so I couldn't pull it out without some more space.
I upgraded my 15 to 20, if I knew what I know now, I would have just bought the 9.9 and upgraded it. Others have mentioned changing the prop, but when I looked it up, the standard prop was the same for both. Haven’t had it out on the water yet, but it runs fine on the Mickey Mouse hose fitting
My question to you and anyone in the group who completed the upgrade to either 15 or 20hp is whether a noticable increase in power was noted at low to mid RPMs, or only at the high end because the WOT max was increased? For example would I expect to have greater speed (and therefore greater fuel consumption) at say 3500RPM (my expected typical cruising speed) after converting to 15 or 20hp? Thanks!
@@SynicalBeats not really as silicone spray stays slippery, where as windex and/or soapy water dry. Thus the rubber still offers support via friction. In most cases like this I use Saliva (yes I spit on it 🙂)
That’s awesome that you can upgrade by 10 HP that easily and for less than $500. Sweet ! Wonder if I can upgrade my Johnson 15 hp to a 30 as easily. Something to look into. 13 mph up to 21, yeah that’s a great upgrade and getting on plane that much quicker. Good job Kyle !
If your Johnson is a 4 stroke that is fuel injected then it might be possible. The only other model that I have heard of people doing it on is the Yamaha.
Not sure. For this project, the 2 different motors are the same except the lower hp one reduces fuel flow with a restrictor plate and then uses a different EFI module. Something you could look into.
Typically all 20hp engine families are the same factory tuned up 15hp, or 9.9 (if EFI). But more than 20hp are a completely different larger engine family so no, its not possible. In the smaller 4-stroke outboards, typically the same engine families are grouped as follows; 4, 5, 6hp 8, 9.9 9.9, 15, 20 (Merc & Suzuki only) 15, 20 40, 50, 60, 70 75, 90, 115
If I was doing this I would check the ignition advance between the two models and the injector size. If there the same spec I would say its the washer between the airbox and the throttle body, that is restricting down to the smaller hp
Would this be the same ECU for a 9.9 that has controlls instead of a tiller motor? I was not able to find any info only manual and electric start. No mention of motors with controlls. Thanks!
I'm not sure. I would think they would be the same, but I don't know for sure. If you called an official parts dealer I'm sure they could tell if you if the part numbers are the same or different!
As an expert on these motors, I state that the control boxes for electric starters and manual starters are completely different hardware and software. You don't need to buy anything, you can flash your control box with the firmware from the 20 engine, the firmware is available online.
You don't have to wait, why should you have to wait? If you have a new control box with the firmware from the 20th motor, you can safely change it right now, no one will know about it. If the motor breaks, just put everything back in, you can wear gloves so you don't leave fingerprints.
I have not experienced that at all. Only thing I can think is that if the throttle isn't at zero then that might be the deal, otherwise, I haven't had that at all.
Two years ago I bought a 2021 lightly used 20 hp Suzuki and now you tell me I could have gotten by with a 10 hp that I could have convert to a 20 with three parts. Peterson below said I wouldn't need the new ECU so there it is. Anyway my stock 20 hp Suzuke does 24.8 on a old Mirrocraft (1968, 14 foot deep fisherman), so you're up there on speed.
I'm not sure. I know the 9.9 and the 20 HP that Suzuki makes use the exact same housing, and really everything is the same except for those 3 simple parts!
Thanks, but I only saved around $40 or so. Though, technically I have an OB motor I can run as 9.9 or 20 hp. Also it says 9.9 so it’s valid on lakes that are 10 hp or less.
Ive got a 2006 yamaha 4 stroke f8cmh 197cc do you know what can be done to this to increase power? I know the newer f8 4stroke with the 212cc is the same as the 15hp counter part and think its just a carb and possibly ecm job on that one but i cant seem to find anything for the 197cc model other than 1 aftermarket carb kit to make it a 9.9
You mentioned that your 9.9 is 2021. So is mine, so because I see at least a few ECUs with different part numbers can you tell me which one you installed? For example 33930-89L20, or 33930-89L30, or 33930-89L40 ? The part#s for the flame arrestor and seal are straightforward. Thanks!
@@Dark30Outdoors My model has elect start, remote/non tiller, power tilt and is, I think, different than yours so I'm unsure whether a different ECU is required or not for those features. It's an expensive decision to get wrong if it cannot be returned. Maybe I need to locate a 2021 DF20 with same features as mine and figure out what ECU is installed. Or maybe I'll just do the 15hp upgrade using a bored out restrictor plate and leave it at that. Decisions decisions!!
As an expert on these motors, I state that the control boxes for electric starters and manual starters are completely different hardware and software. You don't need to buy anything, you can flash your control box with the firmware from the 20 engine, the firmware is available online.
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
I don't know all of them that this can be done with, but I am reasonably confident in saying that all of the models that are 4 stroke with electronic fuel injection then they can be converted!
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
So latest 9.9 efi tohatsu outboard is at 84.9lb so by changing parts to 20hp it still remains at 84.9 lb ...which is nice because at stock 20hp tohatsu, weight of engine is at 104lb...so ur saving 15lb of weight. Question is, 15lb of weight, is it worth all the hassle? Or is it just better to buy 20hp outboard?......
I know there have been some that did not change the prop, but if you run the stock 3 blade nine pitch the motor will run at max rpm right near the redline. I got a 3 blade 10 pitch for mine so I run wide open comfortably below the redline. Pushes my 14.5' aluminum deep v to about 24.5 mph!
Interesting to see if it uses less fuel at the same speed without that restrictor. In a similar thing where the manufacture limited the power output for the same engine, I had a Cub Cadet with a Kawasaki engine that went from 22hp to 25hp by just allowing the throttle butterfly to open fully.
GM used to limit the throttle valve opening angle on some cars when they had corporate edicts on the amount of power for that size car. One of the first buff-book recommendations was to have someone fully depress the accelerator pedal while you stared down through the top of the carb - of course with the engine off and air cleaner lid removed. If you saw the throttle plate wasn't going vertical, you could look for what was stopping it short and remove that restriction.
Good question! I know guys have done it without changing the prop, but the standard Suzuki 9.9 comes with a 3 blade 9 pitch prop and the 20 HP conversion will come close to the RPM max out. This can be harmful to the motor. I mistakenly bought the Hight Thrust model which comes with a 4 blade prop. I didn't realize at time of purchase. So, I switched to a 3 blade 10 pitch which will keep me below the RPM maxout, and I am still getting up to 23 mph top speed!
Did you buy the parts direct from the Suzuki dealership in the US or did you get them from your local boat shop? I was looking into doing the mod if I ever came across a second hand Suzuki 9.9 HP outboard but I wouldn't know where to look for the parts.
Does anybody know if I can upgrade my 5hp Suzuki 4 stroke to something a little bigger in the same manor?? I'm seriously lacking in knowledge on all things outboard related. Thanks.
Yeah, I bought a high thrust model not realizing it was a four blade prop. So, I had previously swapped it out for a 3 blade 10 pitch knowing it would keep my rpm below the rev limiter when I made this switch.
People have been recarbing older ob's for years! In fact, before this one came in I bought a temporary ob that was a 9.9 Johnson recarbed to a 15 hp. However, I am unfamiliar with how that is done.
@@Dark30Outdoors thank you. I will do some research on the part numbers. I have a 6hp Suzuki so i believe i can't recarb it with a higher hp carb one but I'll try
Mine is a 2021. I’ll see if I can find the model number. Might be in my unboxing video for when I received it. I believe every year that they make that is electric fuel injection can be converted this way.
I have a 15 HP Yamaha two stroke that seems to not have much HP's. From the owners manual the 15 and 25 HP have the same bore and stroke. Anybody know the difference that gives the 25 the extra 10 HP's?
I carbed up my 1974 65hp evinrude triumph to a 75hp I had to put a higher pitch prop on to get my rpms down to safe run level idk if you will have to do the same or not.
Yeah, I bought a new prop last year because it came with a HT 4 blade! YUCK!! So, I knew I would be doing this conversion. and a 9 pitch would have put me right at the red line. So, I went with the 10 which will keep me safely under the red line! Also, a great point!!
Nothing more gratifying than doing something yourself to save money.
You got that right Tom!!
Nice demonstration and glad you took it out on the water too. Didn't even know you could do that. Appreciate you sharing the knowledge.
Yeah, it was easier than I thought it would be. Thanks for watching!!
That’s awesome! Never knew you could do that. Looks pretty easy.
Yeah, it wasn't hard at all!
with the new found torque, you can install a 12 or 13 pitch prop and get significantly more top speed out of that motor now.. Probably closer to 28-29 mph
Awesome! Thanks for the tip!
There is no need for a new ECU, I did this same conversion and by the advice of a Suzuki tech he said the stock ECU would adjust to the added airflow and it did, runs great.
Only parts you need are the flame arrestor on seal
Glad to know that is working for you!
@1224Peterson Still no problems? I’m thinking about doing this but the ECU is really expensive.
@@kitkat101 Running like a dream!
@@kitkat101 No issues, I've been checking the spark plugs and they look good, no signs of running too rich or too lean so the ECU is doing it's job. You will need a new prop tho, I got an 11 pitch, the stock prop on these are horrible anyways so budget for a prop as well
No ECU swap abd you won't get higher revs. 20hp revs much higher
A prop change would increase speed.
The 20 horse has a different prop.
The ECM controls max rpm.
Yes, mine was changed.
To what? Did it help? Going to do this asap
Gotcha going on all four of my channels! You should be getting your watch hours very soon! -The Reef Robber
Awesome! Thanks buddy! Each day I check it, and they have a funny way of doing math, but I just keep going!! lol
@@Dark30Outdoors I know what you mean! You’ll get there
The Reef Robber is on here running all your videos for you. Hope you get your hours soon!
Man! Your video was awesome thank you. I’m soon to get the Suzuki 9.9 2022 4 stroke short shaft. Thank you for sharing that. If I ever have the need to up it to 15hp or 20. I now know how to do it. So amazing again thank you. Your video was super informative. Great job.
Thank you! I appreciate the kind words!!
Hi Robert, I just got my 2022 9.9B today, cannot find anyone selling the 2022 ECU and parts. Did you just go to the dealer? Is yours a 00995F-24xxxx?
@@tonymclean1707 i went ahead and got the suzuki 6hp
Nice of you to share and make the video, thanks!
We used to put the 9.9 cover decals on 15 hp motors, forty-something years ago.
That’s another way to go! 👍
We used to do that with a 6hp Mercury cover on a 15hp Mercury, just to fool the police, my little Zodiac Cadet 310 used to go over 50kph with that 15hp Mercury, the whole boat and motor combination weighed like 90kg with a full 24 liter tank.
@@Dark30Outdoors
Try putting the original control module in and test the speed and acceleration just by removing the air restrictor.
? ? ? Will it run a little bit better or a little worse or alot worse?.
Manufactures used to put 9.9 carbs on the 15's to meet the 9.9 rule when it first came out. I have a Gamefisher like that.
@@BobWiersema Yep, and guys would do a carb conversion on them.
That's a serious restrictor plate, heck it can hardly breathe.
Haha! It certainly is!!
@@Dark30Outdoorsalum creek north of Columbus ??
@@jeffconley819 yes!
Right that's almost worse than a full choked carb..
Hi there, I have since been told the ecu does restrict the rev limit. The 9.9 revs to 5800 the 15 to 6000 and the 20 to 6200 that's how some of restriction works
That makes sense!
Get a 20hp ecu
Thats great I was under the impression you had gotten a new motor!
No, the upgrade wasn't a purchase but rather a simple conversion!
Showing some love from Canada 🇨🇦 ❤
Thanks!!
Question. Does the Suzuki 9.9 hp 'cowling' fit on a 20 HP (vise/versa) It be interesting to know. Never mind.. I found out it does.
Unbelievable you can convert to that much more horsepower with such few parts. Good job
Yeah, pretty slick huh!!
9.9hp engines are tailor made for specific markets and regulatory rules. like in the EU the maximum engines kids under 16 can use is a 9.9hp engine. Easier to downgrade an existing engine design to meet the hp requirement than making a whole new engine.
@@gromitNOR83def not the whole EU, for example in Finland, a 15 year old can drive boats under 5.5 meters with 20hp motors.
I didn't even realize you could to that! And looked like a simple job. Nice man!
Thanks Joe!!
Looking to do this to a Mercury 9.9 EFI. The parts seems to be the same between the 9.9/15/20 EFIs, except for the ECUs and restrictors on the 9.9/15. Hope it'll be this easy for me.
I think it should be. 👍
@@Dark30Outdoors Yep, it was very similar, and worked. The ECU was a little harder as I had to remove the lower cowling a bit since the electric starter take up some room above the ECU so I couldn't pull it out without some more space.
@@john6268 That's awesome!
Nice upgrade. Great demo video, Kyle.
Thanks! It was fairly easy to do!
I upgraded my 15 to 20, if I knew what I know now, I would have just bought the 9.9 and upgraded it. Others have mentioned changing the prop, but when I looked it up, the standard prop was the same for both. Haven’t had it out on the water yet, but it runs fine on the Mickey Mouse hose fitting
Awesome!! Every little bit helps! 👍
This is so cool Kyle! Nice you went from 13mph to 21mph and your take off n getting on plane quicker. Very nice!
Yeah, since the video I have actually adjusted the tilt and my new max speed is right at 24 mph! For my little boat that's great!!
@@Dark30Outdoors that’s awesome 👍
That was pretty cool Kyle, Thanks for sharing
You bet! Thanks for watching!!
My question to you and anyone in the group who completed the upgrade to either 15 or 20hp is whether a noticable increase in power was noted at low to mid RPMs, or only at the high end because the WOT max was increased? For example would I expect to have greater speed (and therefore greater fuel consumption) at say 3500RPM (my expected typical cruising speed) after converting to 15 or 20hp? Thanks!
My boat sure gets up on plane a lot quicker than it did before! I don't think the increased fuel consumption is that noticeable really.
@@Dark30Outdoors
Really!! That’s All you do to convert 9.8 hp to 20 hp!! Amazing.
It's pretty sweet!!
Where did you get your parts.
Boats.net
Thanks
Little soapy water as a lubricant helps sliding things with rubber gaskets or mounting surfaces in place a lot easier
Thanks! I appreciate that tip!
Windex is great for that, it dries nicely.
Really don't want to get water near a ECM or the connector. Silicone lube spray would be better.
@@SynicalBeats not really as silicone spray stays slippery, where as windex and/or soapy water dry. Thus the rubber still offers support via friction. In most cases like this I use Saliva (yes I spit on it 🙂)
I have no idea what you did but it looked interesting! LOL
That’s awesome that you can upgrade by 10 HP that easily and for less than $500. Sweet ! Wonder if I can upgrade my Johnson 15 hp to a 30 as easily. Something to look into. 13 mph up to 21, yeah that’s a great upgrade and getting on plane that much quicker. Good job Kyle !
If your Johnson is a 4 stroke that is fuel injected then it might be possible. The only other model that I have heard of people doing it on is the Yamaha.
@@Dark30Outdoors yep she’s a fuel injected 4 stroke but she’s also a bit older 2013. She gives me pretty much all I need.
@@bucktalesoutdoors7566 Johnson never made a 15hp fuel injection 4 stroke.
@@igotmesothelioma you’re right my 15 HP 4 stroke Johnson is carbureted. Oh well ! It goes ok.
@@bucktalesoutdoors7566might be able to change the carb to a larger hp one, change fuel pump, and some other things
What size prop did you change to?
I went with a 3 blade 10 pitch. Keeps me below the rev limiter.
Why not Suzuki make different Map configuration in the ECU to change power delivery?
Where did you get the parts to make the conversion? Thanks
I ordered mine from Boats.net.
Sweet!! Do you know if I can get more hp out of my 20hp tohatsu efi 4 stroke?? Please 🙏
Not sure. For this project, the 2 different motors are the same except the lower hp one reduces fuel flow with a restrictor plate and then uses a different EFI module. Something you could look into.
Typically all 20hp engine families are the same factory tuned up 15hp, or 9.9 (if EFI). But more than 20hp are a completely different larger engine family so no, its not possible.
In the smaller 4-stroke outboards, typically the same engine families are grouped as follows;
4, 5, 6hp
8, 9.9
9.9, 15, 20 (Merc & Suzuki only)
15, 20
40, 50, 60, 70
75, 90, 115
Hi, I am thinking of doing the same to my 5hp Honda....what does ECU stand for
@@ShaneAusinka6 electronic control unit
I would love to know how much difference it would be to just replace the restrictor plug with the flame arrestor with the original cd in place.
Good question, but I don’t know if that would have a negative impact on the existing ecm.
If I was doing this I would check the ignition advance between the two models and the injector size. If there the same spec I would say its the washer between the airbox and the throttle body, that is restricting down to the smaller hp
Would this be the same ECU for a 9.9 that has controlls instead of a tiller motor? I was not able to find any info only manual and electric start. No mention of motors with controlls. Thanks!
I'm not sure. I would think they would be the same, but I don't know for sure. If you called an official parts dealer I'm sure they could tell if you if the part numbers are the same or different!
@@Dark30Outdoors thank you, I will look into that.
As an expert on these motors, I state that the control boxes for electric starters and manual starters are completely different hardware and software. You don't need to buy anything, you can flash your control box with the firmware from the 20 engine, the firmware is available online.
Wow, I wish I would’ve saw this two weeks ago. Just sold my nine horse and bought a 20 horse. Great video.
Thanks! 👍
I have a 2021 Suzuki 9.9 and I am waiting for my warranty to expire, then I am doing this to mine. Parts are already on the shelf in the garage.
Sounds good!!
You don't have to wait, why should you have to wait? If you have a new control box with the firmware from the 20th motor, you can safely change it right now, no one will know about it. If the motor breaks, just put everything back in, you can wear gloves so you don't leave fingerprints.
Hey, I sometimes have trouble finding neutral to start my motor. Do any of you guys have this problem?
I have not experienced that at all. Only thing I can think is that if the throttle isn't at zero then that might be the deal, otherwise, I haven't had that at all.
Two years ago I bought a 2021 lightly used 20 hp Suzuki and now you tell me I could have gotten by with a 10 hp that I could have convert to a 20 with three parts. Peterson below said I wouldn't need the new ECU so there it is. Anyway my stock 20 hp Suzuke does 24.8 on a old Mirrocraft (1968, 14 foot deep fisherman), so you're up there on speed.
I'm not sure about skipping the ecu part. I guess you could, but I wonder if you would have injector issues after a long duration of use.
Hi 👋 I love your fish behind you . Thanks for sharing. It’s amazing what you can learn .
Thanks for stopping by!!
Do you think you could do the same to a Mercury 9.9?
I'm not sure, but you could look into it.
Wonder if you had a Suzuki 6 hp with a carb...Is there any hop ups for that? cost? performance?
I'm not sure. I know the 9.9 and the 20 HP that Suzuki makes use the exact same housing, and really everything is the same except for those 3 simple parts!
Awesome upgrade! I thought you might be boring the cylinders 30 over and putting a turbo on it. 😂
Hahaha! Now, I'm brainstorming turbo ideas! lol
Great mod and I am sure you saved thousands.
Thanks, but I only saved around $40 or so. Though, technically I have an OB motor I can run as 9.9 or 20 hp. Also it says 9.9 so it’s valid on lakes that are 10 hp or less.
Ive got a 2006 yamaha 4 stroke f8cmh 197cc do you know what can be done to this to increase power? I know the newer f8 4stroke with the 212cc is the same as the 15hp counter part and think its just a carb and possibly ecm job on that one but i cant seem to find anything for the 197cc model other than 1 aftermarket carb kit to make it a 9.9
The 15hp counter part to mine is supposed to be 323cc so its a fair bigger engine aswell
I really don't know much about the Yamaha motors.
I am intrested of the cost of that upgrade....
I want to ask about the 2 stroke Suzuki ??? what items are you buying ??? can you tell me ???
I don't have any experience with the 2 stroke Suzuki outboards.
You mentioned that your 9.9 is 2021. So is mine, so because I see at least a few ECUs with different part numbers can you tell me which one you installed? For example 33930-89L20, or 33930-89L30, or 33930-89L40 ? The part#s for the flame arrestor and seal are straightforward. Thanks!
The part number that I ordered is: 33930-89L20
@@Dark30Outdoors My model has elect start, remote/non tiller, power tilt and is, I think, different than yours so I'm unsure whether a different ECU is required or not for those features. It's an expensive decision to get wrong if it cannot be returned. Maybe I need to locate a 2021 DF20 with same features as mine and figure out what ECU is installed. Or maybe I'll just do the 15hp upgrade using a bored out restrictor plate and leave it at that. Decisions decisions!!
@@donc2334 Okay, yeah mine is a tiller model. Not sure if it's different for one that is cable steer.
when changing the 9.9 to a 20 hp does the ECM for electric start and manual the same
I think so as it is just a control module for the fuel injection. You could as the parts supplier you order from to be sure.
As an expert on these motors, I state that the control boxes for electric starters and manual starters are completely different hardware and software. You don't need to buy anything, you can flash your control box with the firmware from the 20 engine, the firmware is available online.
Is this possible with other engines & H.Ps
I'm not certain. I have had a few people comment that it is, but I only have experience with the Suzuki 9.9.
I just came across your video. It’s straight forward no bs and informative. Keep up the good work
Thank you! I appreciate that! 👍
Does anyone know if you can upgrade the 2023 9.9 to 20hp? Is everything the same or have they changed anything?
I don't see why not unless they changed the housing or added something and I doubt that to be the case.
I've got a 2013 9.9 Suzuki carby model can you do the same with it or can you only do it on the fuel injected model?
That's a good question! I'd guess that you can, but it would obviously be different parts!
That's very cool that you can change it to a 20 HP with just changing out those 3 parts.
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
@@gordonshumway4763 Do you know where one could obtain firmware for 20 hp, electric start external controlbox?
@@capsterism Hello, buddy!
Write your e-mail.
@@capsterism Hello, buddy!
Write your mail.
@@gordonshumway4763 seems my posts keep getting removed... 😞
This only works on the fuel injected ones?
I believe all of the newer models are fuel injected. I'm not sure how to do the conversion on any of the older models.
What year(s) model of 9.9 is the upgrade compatible?
Mine is a 2021, but I think you can do this with any model that is 4 stroke and has EFI.
Which models and which year builds?
I don't know all of them that this can be done with, but I am reasonably confident in saying that all of the models that are 4 stroke with electronic fuel injection then they can be converted!
Check to see what sparkplugs go on the 20 HP. Might be best to run with them.
I believe they are the exact same. 👍
The restrictor allows running only at very low speeds…. Pumping losses go way up once you go much above Idle speed.
You need to swap the prop to a higher pitch to absorb the additional power. That will give you a higher top speed.
Yes, it was previously changed! 👍
Can you do this to a Mercury 9.9 ? Mine is a 2022 non EFI and I would like to convert to a 20
Possibly, but I don't have any experience with Mercury outboards.
I'm from the Coboconk area. Where did you get the parts? Thanking you in advance
I bought mine from Boats.net
@@Dark30Outdoors Just ordered it. Thank you! Now I'm going to sell my 15hp ECM
What build year is your 9.9 now a 20hp suzuki.
Mine is a 2021.
Mine is a 2021.
@@Dark30Outdoors thanks for the reply. you know if it works on older models or from what year this mod is possible?
@@QuickJoe I believe it can be done on all 4 stroke modes that have electric fuel injection.
Can you provide your model number on here please? @@Dark30Outdoors
Have you had any issues with the engine after doing this as it’s a couple years later
No, none at all. In fact, I will be doing a 3 year review for the motor very soon!
Can you do it on tohatsu? And with new hp is it heavier?
Possibly, but I’ve never looked into it with that brand.
What year motor do you have wondering if I can do this to my 2019?
Mine is a 2021, but I think as long as it is electronic fuel injection then it can be done!
@@Dark30Outdoors thank you I’ll try it
Hey will this work on the new gray susuki outboard 9.9 motor?
@@ASMRLIVEFEED it should! 👍
Hi , what it was the price for all parts ? Thanks for the video
Listed in the video description, at the time I paid approx $458 for the 3 parts!
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
Larger prop will increase top speed and still give good hole shot. Try stainless cupped prop, big difference.
I might some day, but for now I really like what I got.
So latest 9.9 efi tohatsu outboard is at 84.9lb so by changing parts to 20hp it still remains at 84.9 lb ...which is nice because at stock 20hp tohatsu, weight of engine is at 104lb...so ur saving 15lb of weight. Question is, 15lb of weight, is it worth all the hassle? Or is it just better to buy 20hp outboard?......
I’m not familiar with the Tohatsu brand. On the Suzuki, they build their 9.9 and 20 exactly the same so both weigh the exact same.
The same weight with Tohatsu 9.9 15 20hp are 104p for manual start
@@HomeAndTravelUSA thnx
If bought new what would be the difference in retail price between a 10 and a 20 ?
Not sure. That wasn’t much of a factor for me.
What is the cost difference between a 10 and 20hp motor off the shelf?
Back then it was maybe $480 so u didn’t save a ton of money, but that’s not why I did it.
Hi, Have you had any problems with the conversion? Thanks
None at all! The motor runs like a champ!
Do you have to change the prop to optimize?
I know there have been some that did not change the prop, but if you run the stock 3 blade nine pitch the motor will run at max rpm right near the redline. I got a 3 blade 10 pitch for mine so I run wide open comfortably below the redline. Pushes my 14.5' aluminum deep v to about 24.5 mph!
Thank you so much, I'm going for it soon
@@PJ_2761 Awesome!!
Will it make it use more gas?
To some degree, yes. However, it is not really noticeable.
What year is the motor from. And the cost for parts
Mine is a 2021, and the approximate cost of the parts when I bought them was around $440
why did you have 2 prop wakes?
Hmmmm, that’s a very interesting question!
I want to get mine done like you how much and where you get the parts?
Boats.net. I can’t recall price, ballpark 2 years ago around $445 for everything.
I bought a new Suzuki DF15. Can you advise me what fuel to use? PB95 or PB98?
I use ethanol free gasoline in mine 100% of the time!!
Check your manual??
Hi I already asked this but cant find my comment, I have a 2016 DF9.9B suzuki, would this ECM work for it as it is a older model, thanks!
What about the 2 stroke dt9.9 can it be 20hp .
That would be a carb rebuild.
Hi, what year is your outboard? What years of outboards can you do this?
Mine is 2021. I believe it can be done every year that is 4 stroke with electric fuel injection.
Does this work for a 2008 suzuki 4 stroke? (9,9)
I'm not sure. If it is fuel injected, I guess maybe.
Interesting to see if it uses less fuel at the same speed without that restrictor. In a similar thing where the manufacture limited the power output for the same engine, I had a Cub Cadet with a Kawasaki engine that went from 22hp to 25hp by just allowing the throttle butterfly to open fully.
If I had to guess it likely uses a bit more fuel, but it isn't so much that it is really noticeable at all.
GM used to limit the throttle valve opening angle on some cars when they had corporate edicts on the amount of power for that size car. One of the first buff-book recommendations was to have someone fully depress the accelerator pedal while you stared down through the top of the carb - of course with the engine off and air cleaner lid removed. If you saw the throttle plate wasn't going vertical, you could look for what was stopping it short and remove that restriction.
Pretty cool conversion! Good video man!
Thanks Matt!!
Do you have to change the prop?
Good question! I know guys have done it without changing the prop, but the standard Suzuki 9.9 comes with a 3 blade 9 pitch prop and the 20 HP conversion will come close to the RPM max out. This can be harmful to the motor. I mistakenly bought the Hight Thrust model which comes with a 4 blade prop. I didn't realize at time of purchase. So, I switched to a 3 blade 10 pitch which will keep me below the RPM maxout, and I am still getting up to 23 mph top speed!
Did you buy the parts direct from the Suzuki dealership in the US or did you get them from your local boat shop? I was looking into doing the mod if I ever came across a second hand Suzuki 9.9 HP outboard but I wouldn't know where to look for the parts.
I ordered them from Boats.net
do you think you could convert a 15hp 2 stroke to a 25hp?
Im not sure if that can be done or not. I don't know much about carburators. It's a very different fuel system than a 4 stroke!
Does anybody know if I can upgrade my 5hp Suzuki 4 stroke to something a little bigger in the same manor?? I'm seriously lacking in knowledge on all things outboard related. Thanks.
I’m not sure if they make anything with more power but the same size as the 5 hp.
the 9.9 and 20 cost about the same from the jump?
About the cost of the parts, but I outlined in the video why I went with the conversion. Thanks!
Did it void the warranty
Yes, but I wasn’t worried about that at all.
Is the Suzuki 9.9 injector or carb model ?
It is electronic fuel injection.
I dont mean to be picky but shouldn't you increase prop size as well?
The prop had previously been changed to a 10.
Did you change the 9.9 prop? The 9.9 comes stock w a 9.25 x 9 you said you had a 10 pitch?
Yeah, I bought a high thrust model not realizing it was a four blade prop. So, I had previously swapped it out for a 3 blade 10 pitch knowing it would keep my rpm below the rev limiter when I made this switch.
So if it's carbureted no chance of upgrades?
People have been recarbing older ob's for years! In fact, before this one came in I bought a temporary ob that was a 9.9 Johnson recarbed to a 15 hp. However, I am unfamiliar with how that is done.
@@Dark30Outdoors thank you. I will do some research on the part numbers. I have a 6hp Suzuki so i believe i can't recarb it with a higher hp carb one but I'll try
Just found this, but what year/model number is your motor and what other years are the same, or how to find out? Thanks.
Mine is a 2021. I’ll see if I can find the model number. Might be in my unboxing video for when I received it. I believe every year that they make that is electric fuel injection can be converted this way.
@@Dark30Outdoors Thanks. Model number should be on a plate or something along with serial number, yes?
What can be done to the HONDA 8 HP 4 Stroke outboard?
Not sure. I don't have experience with Honda OB's.
I have a Mercury 9.9HP can I do the same?
I'm not sure as I don't have experience with Mercury outboards, but it's worth looking into for sure!
I have a 15 HP Yamaha two stroke that seems to not have much HP's. From the owners manual the 15 and 25 HP have the same bore and stroke. Anybody know the difference that gives the 25 the extra 10 HP's?
I am not real familiar with the Yamaha's, but if it's a 2 stroke, I'd guess that it has something to do with the carburetor.
I carbed up my 1974 65hp evinrude triumph to a 75hp I had to put a higher pitch prop on to get my rpms down to safe run level idk if you will have to do the same or not.
Yeah, I bought a new prop last year because it came with a HT 4 blade! YUCK!! So, I knew I would be doing this conversion. and a 9 pitch would have put me right at the red line. So, I went with the 10 which will keep me safely under the red line! Also, a great point!!
@@Dark30Outdoors What's the diameter?