Yamaha carb adjustment instructions?

The cap is the epa not wanting you to adjust idle mixture.
And you shouldnt have too.
Just clean the carbs and put it back togther as it was and it should be good to go.

 

You dont need to adjust anything imo.
Your problem is it has 10 hours on it then it sat and I would bet money on at least one of your idle jets (tiny) are clogged causing the hard start.
Trust me

 

I cleaned mine a while back and was told by a Yamaha mechanic who looked it up in a book he had to set the idle mixture needle valves at 1-1/2 turns from seated as a starting point and adjust from there. That worked and I didn't touch them. (I have a 90)

The only other adjustement was idle speed located on the throtlle linkage of one carb. I did lower my idle speed.

I just cleaned under the cap by squirting carb cleaner through the hole with an infant nasal aspirator and then air. I did the same with all the other parts and it worked out fine.

 

Your right it does have a needle, and seat like any other carb I just cant understand what you mean by you cant find it?
Sorry im not following you

 

You really are losing me matty.
I thought about it and im pretty sure ive never done a 50. I have done 60, 70, 90 40, 25blah blah.
Anyways I checked the microfisch just to be sure and its almost exactly like the 90.
Fwiw I looked up a 2005..

 

I'm just not going to say it, same thing we went through with setting the timing on his Merc. Everyone wants to be a boat Mechanic. Those carbs are simple, I can have them off, cleaned, back on and running in an hour. Take it to a shop!

Also didn't in the other post you tell me that the carbs were just rebuilt by a Yamaha dealer, as I told you the carbs would need to be gone through due to the lack of use.

Also those pictures don't show the air/fuel mixture screw (not called idle mix screw) the air/fuel mixture screw is located on the outside of the carb just like every other 2 stroke outboard carb in the world!

 

Not to confuse things anymore than they already are but which type of screw is located under the brass factory plug that has to be drilled out to expose? I know I had to remove mine on my Yamaha to get to it. Maybe this could be it. Just thinking out loud..

 

Ding, ding, ding and the winner gets!

 

X2

Either take it to a shop or take it apart, leave the idle mixture screws on the outside alone, soak it in good carb cleaner (merc powertune) for a day or two, clean with brakeclean and blow thru every oriface with air, put it back together and go.
As long as no one messed with the tuning screws it should run darn near perfect, like the factory desired

 

Just going by what you said.

I don't care if you do it your self or take it to a shop all my motors run fine to each his own. I was just offering you advice on what you should do as you are not a trained marine tech. I mean really it's $175 to have a shop go through them and then there done right and no guessing, BTW if they are not right they will burn a piston up and you will need a rebuild.

 

If you cave in Gordon at central florida marine knows that engine very well. Not cheap but they can fix it. They always serviced both of my yami's (f40 and 50 2strk) and did a great job.
Hopefully you are not reverse engineering someone elses project.

 

Surf he has a simple carb issue that would take any Yamaha tech about an hour to fix, no reverse eng. going on just needs some who knows what they are doing.

That motor is about as simple as it comes, Suck, Squeeze, bang that's about it.

 

Blow