F50TLRV Carb Sync/Balance

[jackmanjls]

I'm helping a friend get his 50hp up and running. We've taken the carbs off and cleaned in ultrasonic cleaner. On close inspection we found 2 carb gaskets that needed replacement.

I'd like to know where I can find the procedure to sync/balance the carbs. I know it's in the manual but he is very frugal (he's cheap).

Any suggestions on where I can find this?

[greasyshaft]

You will need a 4 channel vacuum gauge.

[jackmanjls]

i still need the procedure.

[rodbolt17]

the procedure is way to long to post.
that model uses a rube****berg cold start system that must be delt with at the same time.
my tech mate was about 650 dollars several years ago.
I did have a precision 4 guage setup that was about 175.
either bite the bullet and buy the tools and service literature or take it in and have it done.

[TownsendsFJR1300]

Is it pretty much using a manometer and hooking up to the vaccum ports? Adjusting once up to temp?



http://www.carbtune.com/

[rodbolt17]

no
on the old setups that used the rube **** berg setup the carb linkage was solid.
you set all 4 carbs at a different vacuum than #4.

then you have to set the choke unloader and cold idle speeds.

its a paain in the rumpus.

the entire 4 or 5 page long procedure is in the service manual.

the only other more aggrevating 4 stoke to deal with is the merc designed F40.

the above posters system made it from about 96 until 2000.
01 changed to a simpler easier setup.

[TownsendsFJR1300]

no
on the old setups that used the rube **** berg setup the carb linkage was solid.
you set all 4 carbs at a different vacuum than #4.

then you have to set the choke unloader and cold idle speeds.

its a paain in the rumpus.

the entire 4 or 5 page long procedure is in the service manual.

the only other more aggrevating 4 stoke to deal with is the merc designed F40.

the above posters system made it from about 96 until 2000.
01 changed to a simpler easier setup.

Sounds like it. Thanks for the update/info

[boscoe99]

The procedure is eight pages long. Quite the clusterf__k with this particular model.

If you are familiar with synchronizing carburetors, then forget all that you know when it comes to this model. Your eyes may glaze over upon reading the SM for the first time or the tenth time. These are the things that are to be checked and adjusted if needed.

Idle speed adjustment
Carburetor synchronization
Pilot screw adjustment
Dash pot adjustment
Choke cam angle adjustment
Fast idle adjustment
Unloader adjustment
Choke valve closing adjustment

It is presumed that you counted the number of turns needed to screw in each idle mixture screw so that you can get back to the original production setting. This assumes that someone had not tampered with the carburetors some time in the past. The setting for carburetor number 4 differs from the setting for carburetors numbers 1 -3 by the way.

There is a difference between being cheap and foolish. You only want to clean and calibrate these carburetors once.

Upon reviewing the owner's manual if you don't feel up to the task find a mechanic that and let him provide direction to you as he looks over your shoulder. Use it as a learning curve.

Cheapest and best place that I know of to get a genuine SM is from

SIM Yamaha is your reliable Yamaha outboard motor engine OEM parts dealer!.

[jackmanjls]

Uncle, uncle...I'm tapping out.
I'm convinced that this is beyond the scope of what I personally want to do. I will have the local marine shop do this.

[boscoe99]

Uncle, uncle...I'm tapping out.
I'm convinced that this is beyond the scope of what I personally want to do. I will have the local marine shop do this.

Just a thought. Call Yamaha customer support first thing in the morning at 0830 hours (866) 894-1626 and see if they will fax to you the pages from the SM that address the work to be done on the carburetors. You will then be able to see if this is something you want to take on, or not. At least it will give you an appreciation of what your mechanic will be doing.

[99yam40]

Or at least what he is suppose to be doing if they are up to snuff on the proper procedures.

Make sure you take it to a Yamaha shop that has techs that have been trained

[boscoe99]

Or at least what he is suppose to be doing if they are up to snuff on the proper procedures.

Make sure you take it to a Yamaha shop that has techs that have been trained

and keep your fingers crossed that the shop will have someone trained in doing the specific work that is needed. Or that he has done it within the last five or ten years. And that he is the one that will actually be doing the work.

Yamaha has so many different models, with so many different configurations, that I daresay no single Yamaha mechanic (master mechanic or not) will have seen and done all that there is to be done.

Many won't see a jet pump model in their life time. Many won't see a V8 F300/F350 in their life time. How many have had the opportunity to trouble shoot a boat and motor with the new Helm Master installed? Older mechanics might retire before they can get an opportunity to be up to speed on the new stuff. The new mechanics may never see (or want to work on) one of the older style two or four stroke motors.

Too many combinations of stuff and it changes faster than most can (or will want to) keep up. Hard to get new guys to become mechanics in the first place. I hear that they just want to play on computers and such.

[jackmanjls]

B99, this is great advice. I can definitely see your point. Tx for the info.

[TownsendsFJR1300]

And please post your final, "what happened", or fix if you would...

[rodbolt17]

and that's why I like where I work.
I get jets,F350's, helm master in both Yamaha and Volvo.
blowboat and dingy kickers.
and like its been said, I still get to see new things.
most of what I work on is 150 and up with twins.
we do have a few F350 triple models.
they bite to service.