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Thank you so much for breaking this down I’m swapping on a 9.9 merc to a 15 and this helps so much

th-cam.com/users/shortsybzhBk-TxNc?si=NeSRUtSY_d_921-F

Hey, gantastic vid! I have an F9.9 yamaha, is there anything else i need to change to pick up the extra speed? i bought a 15 allie xpress, do i need anything else?

@Captain315 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?

Good video old man u should come up here to ky so we can go fishing up this way

sounds like rpms are little more than up. I'd imagine a different prop pitch would help a bit.

Sweet little update!!

Can't beat a plate of catfish

Duracraft made a 15/19/36 as well decent boat. The design of the boat takes away from the top speed. I didn't think it mattered as much and I could hp through it. Put a M50D on my 14 ' StarCraft it would only run 31. Put that same outboard on my fast craft and it runs 55. Y'all stay safe out there!

Yo it the people you traded boat motor with nice video it joshes son

What do you use for fuel delivery? My kohler has a pump on the rocker

I heard that's the only difference is the bore size and some jetting. I would keep the 9.9 carb and bore it out and jet it accordingly as to what the spark plugs show. Great video.

What is the diameter of the hole on the intake manifold? Does it match the 9.9 or 15hp throat size? If it is smaller to match the 9.9 carb will there be any conflict with the butterfly flap on the 15 hp carb and if it is smaller than the 15 hp will that impact any gain in hp? I'm looking to do something similar on a mercury. Thanks!

I swapped a vertical to horizontal splash lube briggs back in 2010. I had bought a Cub Cadet 582 with a broken rod and used a very late, (I'm guessing around a 2002) vertical twin from a MTD lawn tractor. The MTD had very little use and was abandoned at the lawnmower shop I worked at sometime around 2005. I ended up selling the Cub to a guy I worked for at the time and he used it for about 6 years to cut his grass. Flash forward to 2021 and I ended up buying the Cub back. I know this is a long story, but I have been using the Cub up until this year when I started having serious blowby issues with one cylinder. Turns out the RH breather valve facing the flywheel came apart, (ie. the bakelite flapper broke). When I removed the breather the lifter valve spring area was HALF-FULL of oil! Turns out there was no way for the oil to return back down into the crankcase! There were two holes, but would only work in the vertical position not horizontal. I overlooked this when I assembled the engine. I have taken the engine apart and drilled two holes (one in each area) for the oil to go down. I hope to get the engine back together sometime next week. I was also getting a lot of smoke on startup, I hope this fixes the issue.

Hi, I have a 9.9 hp I 2004 I want to upgrade to 15 hp, do you have a link to a Chinese page where they sell this carb ?

That is a great setup, if I ever get around to redoing what I’ve got (bmx brake handle) I’ll try this. Thanks for the great information and video

Been there done that use it to pull logs ..

Killer great info man!!! gonna apply it to my next build

Awesome looking tractor thank you for the video

Great info, I have similar spring set up on the Towminator..

Awesome video dude I want to put a gas pedal on my gt6000 Sears Magnum I have one question to ask you do you know what a Sears Magnum gt6000 rear end oil would be my son got me this tractor so I'm putting Harbor Freight motor on it this is 13 horse to plow some snow or push some dirt thank you for the video

Interesting!! I’m only one sub from 700!!!!!!!!!

Just subbed! This is awesome!

Thanks for all the details! Great video.

This is a great series and wealth of knowledge your sharing captain, much appreciated! Quick question, do you prefer aluminum or cast iron intake manifolds for vertical shaft oppys? I have both. My thought is aluminum dissipates heat better and is easier to remove material from. Any pros for cast? Thanks!

Captain, did you do any upgrades to the valve train? If you used different springs, what did you go with?

Your welcome my friend! It was great to finally meet you!

Really great rig, held up to to a place that just abuses tractors. I will take a bent draglink and a lost spring eyelet as a win in my book!

Love this thing so much it’s a absolute animal, you went outside the box in almost every aspect and it really paid off!

Nasty is a mean machine and when you’re on it you’re a whole different driver! When you hit the big flat rock on chadalack I was wondering if the N/As had you messed in the head or something, that was completely out of character for you!

Great update! After watching the build videos it’s cool to know what works and what didn’t!

Awesome update on nasty! I love it

Nasty was definitely a trail magnet even in the rip session I don't think I saw the front end come off the ground

Seen some of the other guy's videos. Nasty was looking good! Always happy to see more of it in the future!

So I have a F9.9MSHC 4 stroke high thrust 6G9 group from 2004 and has the warm up solenoid on the top wax operation I believe OEM is discontinued and would wonder if I can use this one and if the solenoid simply mounts to the top of the ones you have on the table via the two screws on top? any direction is appreciated in advance. Cheers crowley and CPN also iboats are conflicting it is possible is carb would be different but work?

did you ever do the F9.9 F15 carb part 2?

I looked at the engines and the f15 seens to have larger cylinders or cc if i understand right, there is also quite bit of weight difrence. But from a cc to horse power calculator we should be able to get more out of the 9.9 :)

I want to build a 7 1/2 gauge train with one. Gas electric.

Thanks for sharing!!! Love it.

You got my attention I just subscribed to you I just got on Sears Magnum 6000 Motors got some scarring on the pistol walls I see you do some redoing the motors thank you for the video

Looks awesome Cap'n315....

I do love the Massey Fergussen grills!! I have to find an opposed twin (vertical) the one with the pulley on the side not the bottom.....Like the one in Nasty....cut twice measure huh?

They are looking good buddy

Awesome machine, Captain!!! I'm a Wheelhorse nut and love all the work you do to those awesome machines. Hit & Miss....soooo COOL!!!!!!

Yes, me and my grandson have just like it ours is a 1967 Sear Serbin with the 10H.P Tecumseh we have the 3-piont hitch with ground plow and harrows. WE pulled it one time at the In Farmington Fair grandson took 1St. with it.

Wow those headers are wild, Nasty is absolutely unique. Looking forward to seeing it in action. Been thinking about getting a second build myself, one with a lot less stuff and work done to it so I can beat on it without worrying about it. Probably gonna go with a GT6000 or Sears with a 633 Great update video keep em coming we love it

Nice update! I'm just the opposite. Sears guy enjoying and loving a Wheel Horse. Great work as always!

Torturing me with the long tubes and no sound demo👀 I got my 46 big bore block back for the shop, cylinders were honed for arc pistons so I can clearance everything. I also happened across a horizontal i/c pluss just need to save up cash for it😉

Absolutely love it, i always love seeing a captain update!

Appreciate the update ! Both machines are great but I’m pumped to see nasty out and about