Yamaha 4 Stroke Outboard Engine Carb Rebuild Series [2] Carb Disassembly and Cleaning

Continuing with part two, we will be disassembling the carbs from the air silencer and manifold brackets, and begin the disassembly of the carbs for inspection and cleaning. First Id like to know where the pilot screws are before touching anything so each of them are drawn into soft seat and the values are recorded. All were found within spec. After this, all bowl drains are removed for a pre-inspection of the back of the bolts for rot of any kind and none was found.
With the preliminary work out of the way, the accelerator pump is removed where it is immediately found that an inappropriately shortened air line has cracked causing an air leak in this system. This will be repaired later. After this the silencer is removed, working the bolts from the middle outward to break tension. With the bolts gone the silencer and brackets are put off to the side and washed leaving the four carbs behind connected by fuel lines.
The carb fuel lines are in two groups, the fuel from the pumps and from the cold start valves. Cable ties hold them together and are removed to separate. It is noticed a brass fitting is broken in carb 4 requiring repairs. With the hoses separated, all four carbs are now separate. The project will start at carb found (bottom) and work up to one (top).
First I took a minute to try to remove the broken brass fitting from the the hose on carb 3. Someone glued it in, and I ended up cutting the hose to remove it. Carb four will Now be completely disassembled. This carb has no cold start valve. No major contamination was found in this carb, everything was cleaned with brake cleaner and blown out with compressed air. I was not happy with the carb rebuild kits I had. The recommended OEM and if desired, a NON-OEM kits are shown below.
YAMAHA CARBURETOR REPAIR KIT MERCURY 40 45 50 HP 4 STROKE 62Y-W0093-11-00
amzn.to/3mhxuOH
NON OEM version
amzn.to/41i3vVL
J-B Weld 8265S Original Cold-Weld Steel Reinforced Epoxy
amzn.to/41euMbr
With my kit I opted for using the existing OE parts in the carb if they were still good, effectively using the new seals and float bowl needle only. If I had the OE I would have swapped everything.
The Float of the Chinese kit against the old OE was measured. The old OE was 10mm which was correct. The new one was way off. The old float was reused. The carb and brass piece is prepped for repair.
CARB DATA COLLECTED
Carb 4: 2 Turns - 114/39, float 10mm
Carb 4 is then reassembled and inspected, put back in line and carb 3 is pulled next, though ill need to get some JBweld...
Onto the rest of the carbs......
#yamahaoutboards #yamahaoutboards

[@TSNOutdoors]

Doing this to my Yamaha as I’m watching and man you made it easy!!!!! Keep it up

[@delorean1]

Glad it was helpful.

[@TSNOutdoors]

@@delorean1 I am looking for the part number for the valve cover gasket. I took mine off when also messing with fuel pump and the seal broke

[@user-mo4fq4hb1e]

Outstanding video! These two lessons walked me through a rebuild on my exact motor, and I'm very grateful to have watched them. I'll still use my local boat shop to do the work, as I'm a fairly senior Senior with a bad case of Essential Tremor, and I don't do well with little bitty pieces and finesse or precision, but now I understand what the process is and can appreciate the skill and patience it takes. Many thanks.....

[@roberthiggins2162]

Great video. Thank you for not having any stupid music. Best videos are with sound effects and narration.

[@delorean1]

Glad you enjoyed it.

[@tact1820]

Your narration is really good and follows the order of operations nicely

[@kovo5121]

Thank you for sharing! Assuming those who watched this video might have a similar motor, just wanted to share another channel - Dangar Marine, where a lot of work has been done to a four stroke Yamaha 50

[@delorean1]

Thanks for sharing!

[@Saturnal01]

This is great.. quick, clear, and detailed. Thanks very much.

[@delorean1]

Glad it was helpful.

[@Kosmos-77-]

Nice videos! Looking forward to the next episode. After that i might have the guts to take apart my own carbs..

[@delorean1]

Chapter 3 is almost ready for release

[@TSNOutdoors]

Great videos! I am currently looking for a new valve cover gasket for this motor because I had to adjust my valves and the rubber gasket broke would you happen to know the part number?

[@tyslink]

Also I shelled out the $$$ for OE carb kits...cost me over $300 all together! But like you I prefer to use OE parts, especially these days when all the other generic Chinese stuff is usually so bad.

[@delorean1]

It worth the time to redo it due to cheap parts.

[@DonTeifke]

Tremendously informative and well done videos. Does the one kit rebuild all four carbs or do you have to order 4 kits?

[@jacquelinesmuniz1]

Boa tarde amigo onde acho os reparos dos carburadores aqui no riu de janeiro eu não achei

[@jcdaniel55]

What do you do if you find green/discoloration on any of the bowl drain screws? What does it mean? What would you do?

[@delorean1]

Clean out the bowls with carb cleaner and a brush if necessary

[@emmanouhlmanoukarakis-pm6zp]

Tο Κιτ επισκευής από Κίνα που μπορώ να το παραγγείλω?

[@sliquenick_]

My 90 sputters and dies at idle. Think this is the carburetor?

[@delorean1]

Clould be, maybe the idle adjustment as well

[@dba444]

Hello can you tell where i find cheapest item for my yamaha f50 aet 1996 carburator fix.. i may just need sealings and o rings.. 62y-w0093-00

[@delorean1]

Check this... amzn.to/3O4QlYJ

[@tyslink]

You keep saying "brake cleaner" and "carb cleaner" as your spraying the parts...I've heard you shouldn't use brake cleaner on carbs...are you just using the term generically or are you really using brake cleaner? I think the only reason you aren't supposed to use brake cleaner because it can harm rubber/plastic pieces...but I'm no expert.

[@delorean1]

I use brake cleaner. Not carb cleaner. It’s personal preference.