15HP Carb on 9.9HP 4-Stroke Yamaha Outboard
ฝัง
- เผยแพร่เมื่อ 2 ต.ค. 2024
- I swapped the 2007 9.9ELR2 carburetor for a 2005 15ELHD carburetor.
Amazon Associate
Here's the carb that I used: amzn.to/2F3DiAV
Here's the same one that's an off brand and a little cheaper with pictures: amzn.to/2CNF4Yz
I have a brand new Yamaha F9.9 outboard and would love to do the 15hp conversion.
Is there a tutorial or DIY on how to do this?
@quadracer392
1. Is there any other part that needs to be changed along with the Carb?
2. Does the carb swap stress out any other F9.9 4 Stroke component?
3. How's the long term performance after the swap, speed, mileage?
Great video, I want to do the same. I have a new 15ELHD (66M-14301-12-00) carburetor, and need to replace my 2009 9.9FMSH (6AU-14301-11-00) Carburetor, but holes are much wider on the 15ELHD Carburetor. Did you have to replace your intake manifold (whole intake system) also? My understanding your 2007 and my 2009 9.9 4 strokes should be the same. what extras did you have to do?.
Brian Kennedy I didn't have to change anything else at all. The 15hp carb bolted right up without having to modify anything. What you may want to do is look at the parts diagrams of the two motors and make sure the intake tube has the same part number. If not you may need to change the intake tube also.
quadracer392 thank you appreciate the help!
I have 06, 9.9 yamaha same set up w,15 hp carburator it makes a lot diference 23 m/ hour 14 ft lowe alum,boat, thats great.......
What carb did you use mines a 05 9.9 mlh2 4stroke
So swap the carburetor/reed valves from a 15hp motor into the f9.9? Very nice! I had heard it could only be done with 2 stroke motors, but obviously it can be done.. Could you please list all the parts that need to be swapped?
No reeds ,it's a 4 stroke
Great mod. I have a sailing catamaran with 2 x yam 9.9 high thrust I want to convert to 15hp. Did you check if your CDI was the same part too?
Dennis. Have you swapped in the 15 hp card on your 9.9 high thrust? I have Seawind cat with the same set up and would like to make this mod.
@@Dkuett Yes I have. It was easy using a cheap $30 China carb. I had to change the choke shafts and fittings to suit the electric choke but other than that a straight swap
Hey just wondering what App you're using for the boat speed etc. Cheers
It's called Ulysses Speedometer. I got it from the Google play store.
More on
how do you make ur kicker go that fast. mine will only go 4mph. please help thanks.
Nice!
Thanks for the video. Few Q's: What is your Pontoon boat length? What new brand/model carb did you put on? Come with the jet you were mentioning? Thanks! (My father in-law has a 10hp max on his lake, so he's looking at getting a 16-18' pontoon and doing what you did to a 9.9 Yamaha or Honda.)
Our pontoon is a 21'. I bought a factory yamaha carburetor and it came with all the jets and everything that the 15 HP carb is supposed to have. If you decide to do it make sure there aren't any other differences between the 9.9 and 15hp motors other than the carburetors.
@@quadracer392 was your 9.9 a high-thrust with a 4 blade prop
I have 2005 4 stroke 9.9 Yamaha will the same carb work for mine
Since they are both carburetored it should but I'm not 100% sure. You'll have to compare the parts diagrams. Boats.net is a good place to find parts diagrams to compare them.
Great informative video. The only question I have is what’s the year and model # of your 9.9? I think possibly some conversations might be easier than others as for example in 2001 yamaha made 9 different model 9.9s
Yeah, some very well may be easier to do. I haven't looked at all the different models but I put in the description what mine is and what motor I got the carb from. My motor is a 2007 9.9ELR2 and the one I got the upgraded carb from is a 2005 15ELHD. Only thing I can suggest is compare similar model year parts diagram 9.9 to the 15hp side by side. That's what I did. It took a few days of looking but I found two that were identical except the carburetors. Hope this helps.
Ok great, thanks again good video
Hey do you know if I can do this on my 2012 Yamaha 9.9?
I'm not sure. If it's not fuel injected you'll have look at the parts diagrams to make sure there aren't any other differences between the motors.
quadracer392 What is the website with diagrams to compare parts between the two motors?
Have you got a part number for the carb you used?
Check the Amazon link in the description. That's the one I used and where I bought mine from.
I mean you talked me into it lol
how did you instal that tachometer?
The tach is factory and was actually already install when I got the boat but it wasn't set up right. There is a dip switch on the back to select the number of cylinders the motor is.
do you know if you can buy a thach like that separate?
The brand that's in my boat is Faria and the style is Kronos. On their website it shows a tach that's for all outboards which is probably what you're looking for. I'm sure it'll come with instructions on how to wire it up. The link to their outboard gauges is fariabeede.com/styles.php (
what is the phone app please?
It's called Ulysse speedometer. It's in the Google play store.
What model number is the carb you used?
AH.... I see
I've heard about this mod and been looking for it in action. Great job!
Have you measured your fuel economy? Do you know your gph differential between the stock and 15hp carb? If you have taken down the data, I'd love to know gph at different throttles (1/2, 3/4 and WOT) and your speeds. Thanks!
Poor little baby Yamaha screaming its guts out:((( really should upgrade to something a little bit bigger so you dont burn near as much fuel and it would save lots of wear on your motor by just upgrading to even a 25hp or 30hp.
It was originally used on a power restricted (10hp) lake. It's no more of a load than what would be on a 25hp, it would just run a little faster. It runs in the rpm range that's recommended from the mfg. As far fuel, I can run half a summer on one tank of fuel. I would really like to get a 90hp for it, but price of new one has held me back.
Oh gotch. I myself have a 2010 Crest LE 2270 Pontoon. It’s a standard 2 tube, and its 22ft long. It’s powered by a 2011 Mercury 90hp Four Stroke EFI. We bought it brand new, with the tubes clean and the boat empty, the thing will push the boat 35mph. With a load on, and after sitting in the lake all summer. It will still push 30mph.
Did the 15hp carb on my 05 9.9 Yamaha 4 stroke literally doubled the speed with just me in I hit 20mph yes 20mph. But after awhile the motor acts like it is starving for fuel and misses changed fuel filger, plugs and checked the valves can't understand why it's doing it now and not before any help?
Found it is hitting the rev limiter any way of changing that instead of changing prop or adding weight?
@@shanehall5823 remove Big Bang limiter.
Larger prop. More weight or bigger boat.
How much weight did you have in it?
@@vlogcity1111 about close to 500lbs its a 14ft jon boat with full casting deck etc. But what stuns me is that when I first did it. It wasnt hitting the rev limiter at all then a few months go buy then it starts doing it.
@@vlogcity1111 and you can not remove the limiter
@@shanehall5823 ah interesting. I was joking about the Big Bang rev limiter lol.
It could be cavitation. Maybe try a different trim position or have you damaged the prop in any way? Causing it to cavitate
Best way to sort it is a prop, one size up. Check out Ali express they are about $50 each.
Try maybe a 10 x 11 or 10x12 prop
What size is your prop currently??
I want to do this same carb swap with my 05 8hp Yamaha but the largest prop for it is 9”.
I might even change the propeller shaft on my 8hp to get a larger selection of 15hp propellers.
I’m gonna try and go from 8hp to 15hp lol it’s the same block. I think a little bit wider intake and exhaust, I should get around 13hp.
A 60% increase is bigtime!!!