Yamaha manual needed

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Bign0703
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Yamaha manual needed

Post by Bign0703 »

Anyone have a sharable link to a yamaha manual for a 2004 f50 4 stroke carb motor?

turbotodd
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Yamaha manual needed

Post by turbotodd »

I don't have a manual, but the thought of a carb F50 isn't a nice thought. Those have to be one of the worst, hardest carbs to have to clean (successfully). I hated them. But once "right", that motor absolutely purrs at low speeds!

Had a tiller version on a 548 War Eagle, briefly. Too much motor for the boat.

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MN Fisher
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Yamaha manual needed

Post by MN Fisher »

Bign0703 wrote: 13 Dec 2021, 09:20 Anyone have a sharable link to a yamaha manual for a 2004 f50 4 stroke carb motor?
I found the service manual for the 2000 F50 - maybe it'll help
https://www.manualslib.com/manual/90904 ... -F50a.html

Bign0703
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Yamaha manual needed

Post by Bign0703 »

Thank you so much!!! And yes these are an absolute PAIN!!! IM FED UP WITH THEM!!!

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Pappy
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Yamaha manual needed

Post by Pappy »

You realize you need a carburetor sync tool to get them set up correctly after cleaning. You can have the cleanest carburetors in the neighborhood and the engine will never run correctly if the throttle blades are not set correctly.

turbotodd
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Yamaha manual needed

Post by turbotodd »

The jetting is staggered too. As I remember, pilot and main jets differ between cylinders. Also the prime start system only primes two of the four carbs. The passages in the bowls for the prime start tend to plug up, and they are no fun to get clean. If they aren't squeaky clean it'll be hard to start and it won't idle properly even when hot. Yamaha put out a bulletin for the F40 (3 carb/3 cyl and the 4 cyl/4 carb) and F50X that addressed the cleaning procedure, but they also suggested to replace the bowls on the prime start carbs rather than cleaning them.

gotta use a manometer to sync them too, along with the correct adapters for the intakes. And people wonder why they cost so much to do the job. I wouldn't do them for less than 3 hours labor. Most of the time it was a little closer to 4 hr by the time they were properly cleaned, sync'd and then test run.

Bign0703
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Location: Henning tennessee

Yamaha manual needed

Post by Bign0703 »

Well I got them exceptionally cleaned. Pulled out my sync tool only to find it broken!!! (Haven't used it in a while) but i did get in the manual and found the factory setting of everything and went through and got it set up. Carbs are set to spec and tuned it +-50 rpm per carb as specified to do. Though I don't have the tool I've not really needed one in several years. Starts beautifully! Idles great! Revs great in water! With the hood off!?!?!?! Will run out good til half throttle then big out and die. I've never had one do this. If the hood is on its literally like the carbs are starving for air. With hood off it does great until about half throttle in gear. I mean this motor has been seriously neglected. Gas left in it for 9-11 months at a time while stored, no oil change, no anything in 10+ years. So to say complete nightmare is an understatement. But it's family of a friend of mine so trying to cut him a little slack. He just turned 18 and his grandfather gave him the boat but never did anything to it but try to run it a month or 2 a year.

Bign0703
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Location: Henning tennessee

Yamaha manual needed

Post by Bign0703 »

turbotodd wrote: 30 Dec 2021, 08:51 The jetting is staggered too. As I remember, pilot and main jets differ between cylinders. Also the prime start system only primes two of the four carbs. The passages in the bowls for the prime start tend to plug up, and they are no fun to get clean. If they aren't squeaky clean it'll be hard to start and it won't idle properly even when hot. Yamaha put out a bulletin for the F40 (3 carb/3 cyl and the 4 cyl/4 carb) and F50X that addressed the cleaning procedure, but they also suggested to replace the bowls on the prime start carbs rather than cleaning them.

gotta use a manometer to sync them too, along with the correct adapters for the intakes. And people wonder why they cost so much to do the job. I wouldn't do them for less than 3 hours labor. Most of the time it was a little closer to 4 hr by the time they were properly cleaned, sync'd and then test run.
Manometer? Isn't that for fuel injected? I only knew of the vacuum sync tool and tach.

Bign0703
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Yamaha manual needed

Post by Bign0703 »

Pappy wrote: 28 Dec 2021, 20:43 You realize you need a carburetor sync tool to get them set up correctly after cleaning. You can have the cleanest carburetors in the neighborhood and the engine will never run correctly if the throttle blades are not set correctly.
Yes sir pappy. Thankfully mine are broken! I haven't used them in years so after the move I guess I can't be too horribly mad. They were a cheap set I bought about 15 years ago. But new set on the way and she will hopefully be ready to go by the weekend

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wmk0002
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Yamaha manual needed

Post by wmk0002 »

FWIW, I always go to the official Yamaha website and look up the factory service manual literature number then get on Ebay and search for it. Typically find them for about $20 in like new condition. I appreciate a digital copy but I like having the book with me in the shop or to read through when I can and keep my eyes off the computer screen, which I spend all day on for my day job.
2016 Alumacraft 1648 NCS - 2020 Yamaha 25 HP Tiller - 1992 Johnson 9.9 HP Tiller
https://www.tinboats.net/forum/viewtopi ... 21&t=40764

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Pappy
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Yamaha manual needed

Post by Pappy »

Bign0703 wrote: 12 Jan 2022, 00:39
Pappy wrote: 28 Dec 2021, 20:43 You realize you need a carburetor sync tool to get them set up correctly after cleaning. You can have the cleanest carburetors in the neighborhood and the engine will never run correctly if the throttle blades are not set correctly.
Yes sir pappy. Thankfully mine are broken! I haven't used them in years so after the move I guess I can't be too horribly mad. They were a cheap set I bought about 15 years ago. But new set on the way and she will hopefully be ready to go by the weekend

You must have been around the motorcycle world for a while then.........!

Bign0703
Posts: 23
Joined: 15 Sep 2021, 00:20
Location: Henning tennessee

Yamaha manual needed

Post by Bign0703 »

Pappy wrote: 13 Jan 2022, 14:00
Bign0703 wrote: 12 Jan 2022, 00:39
Pappy wrote: 28 Dec 2021, 20:43 You realize you need a carburetor sync tool to get them set up correctly after cleaning. You can have the cleanest carburetors in the neighborhood and the engine will never run correctly if the throttle blades are not set correctly.
Yes sir pappy. Thankfully mine are broken! I haven't used them in years so after the move I guess I can't be too horribly mad. They were a cheap set I bought about 15 years ago. But new set on the way and she will hopefully be ready to go by the weekend

You must have been around the motorcycle world for a while then.........!
Haha you guessed it. Motorcycles and atvs until about 2007. Started when I was about 8 or 9 building my own lt230 Suzuki and yamaha blaster and took to it like a natural as my father told me. Quit them in high school and started messing with outboards more. But the ole merc tunes have almost always done the trick for me over the years. But I is a new age I suppose so I guess it's been time to adapt for awhile.