Yamaha 4 Stroke Outboard Engine Carb Rebuild Series [1] Diagnosis and Carb Removal

Today in part one we will be removing the carburetors on this 50hp Yamaha 4 stroke outboard motor which has a stumble exhibited at all RPM ranges. The Owner having checked ignition already, and the boat being of recent acquisition, its not a bad idea to do a complete workup and inspection of the carbs and make sue everything is functioning properly. The engine model today is a F50TLRB though the process is the same for a range of Yamaha 4 stoke outboards with carbs.
A demonstration of the stumble will be heard before beginning followed by allowing the engine to cool down before disassembly. Pre-marking of fuel hoses are encouraged if you don't remember where they will return, also returning bolts removed to their original position where possible. The top cover of the engine is popped off after fuel hose removal. Any bolts that cant be reinserted are stored in a ziplock bag with removed hose clamps.
YAMAHA CARBURETOR REPAIR KIT MERCURY 40 45 50 HP 4 STROKE 62Y-W0093-11-00
amzn.to/3mhxuOH
NON OEM version
amzn.to/41i3vVL
Keeping in mind the gas filter and Oil dip stick will be an obstruction, they will be removed from the engine to remove the carbs. The breather hose is held on by a small cable tie. many small cable ties are used as hose clamps throughout this project. The throttle linkage unlocks from the locking tab to disconnect it from the bottom carb.
Ive opted to disconnect the cold start valves from their connectors and not from the back of the engine as a matter of preference. I did pre-label the cables though so it went back to the same position. This was followed by the silencer mounting bolts. and then the carb-inner manifold bolts.
The carb is then negotiated out of the engine manifold with the silencer box and away from the engine. All ports are sealed with clean paper towels. The bag of bolts and clips are stored in the engine cavity and the cover is closed until installation will occur.
Onto Carb disassembly......
#yamahaoutboards #yamahaoutboards

[@tyslink]

Thank you so much for posting these...I have almost the exact same motor and need to do this process, and will be using your vids to help me get through it!

[@delorean1]

Glad it helped

[@roberthiggins2162]

Great video. Love sound effects and no music.

[@delorean1]

Background music has its place.... but it should be in the background about -12db in stretches of really quiet portions of video.

[@JoeKubinec]

Awesome video. Really liked the step-by-step approach. Really like the management scheme for fasteners and cable marking. Top notch video... also really liked your no bs approach... just a thorough information dump. Currently overhauling the 4 carbs on my F100 TLRZ (which is from 2001). Spent a lot of the day dealing with sized screws :(

[@thatflippinrabbit954]

Great stuff look forward to the tear down,you are very clear and concise in your videos.

[@delorean1]

More on the way as I finish editing and post the rest of the work...

[@tnttailchasers1079]

When will part two be up you are the only video out with this motor for carbs and I’m stuck

[@tonyengland4489]

hey young man,, no shit, these are the best youtube "how to" videos I have seen yet!! and thats saying something,, I have over a thousand saved videos and I watch youtube when im not working instead of movies, disney, prime video,, yada yada,, keep up the great videos!!!!

[@delorean1]

Thanks much, glad you enjoyed it.

[@bkstaples11704]

Very nice. Looking forward to the next video. I'm about to do this on mine too.

[@delorean1]

The next video has been released

[@glatisant74]

this is absolutely master, fantastic work, love it! thank you. can't wait to get to my boat with a Selva Ray 8 (yamaha inside) and get this done myself (engine been in a neglect for a few years)

[@delorean1]

Glad you enjoyed it!

[@kina1956]

Great instructional video. Thanks for your time and knowledge.

[@delorean1]

Glad it was helpful!

[@juhatikka3429]

Good god these videos are above good. A big thumb up 👍

[@delorean1]

Glad you think so!

[@willferrell2266]

I’ve got a leak coming from the back side of the carbs so I can’t really tell where it’s coming from I can tell that it’s def dripping from the back of the “#2” carb onto “#3” but I’m not sure whether this is a float/ needle not seating issue or a leaky fuel line on the #2. Do these carbs leak if the bowl overfills? From float not operating properly?

[@willferrell2266]

Also if o pump up the ball o can hear it hiss and see fuel drip down onto #3 does this sound like a ruptured fuel line?

[@delorean1]

If the float gets stuck the pump will keep pushing fuel into the carb at a high rate, it will find a way out.

[@delorean1]

Doesnt sound normal.