Yamaha 60 outboard stalls when taking off

[guitar lover]

Hey gang,
New member here
I have a pontoon boat with an outboard 60 hp YAMAHA outboard 1998 or so that had a service in April 2008. It ran fine up until now one day ran great two days later this! It starts fine idles fine but when throttle is increased it dies every time. I had to idle back to the dock. I don't know much but the guy who did the service wants another $60 to come back out. I have some mechanical skills and am hoping I can check something to save some cash in these hard times. Any thoughts???

 

[rubinjames]

Re: Yamaha 60 outboard stalls when taking off

If it were me I would start with fuel flow to the engine.

Can you borrow a portable gas tank to try, also look at
filters, fuel pump. This is a start.

 

[Yamajoe]

Re: Yamaha 60 outboard stalls when taking off

[but when throttle is increased it dies every time.] are you saying the engine stops completely or does it just loose power back to idle. if the engine stops running, then you are either getting no fuel past carbs or too much fuel ie: choking. I suspect your electrothermal valve (choke) is playing up or your manual chopke setting (red button) in front of carbs is wrongly set.

 

[guitar lover]

Re: Yamaha 60 outboard stalls when taking off

it stalls all the way. I had the same guy who rebuilt the carbs here took a look at it.He rebuilt the carbs this in June of 2008. He thinks a speck of rust is stuck in the carb and wants another 150 to fix it. Now I am $60 poorer and the boat won't even start now that he messed with it. He showed me the red knob and how the boat will run if set wrong but it started before

Never mind that. The boad will start if i turn the red switck counterclockwise choking the motor but runs rough and then dies. How should the red switch be set? all the way counter, clock or in the middle?

Thanks for taking the time to reply

 

[ibanezjeepguy]

Re: Yamaha 60 outboard stalls when taking off

if I remember, all the way counterclockwise is manual fuel delivery for warm up, middle is off, and clockwise is to let the electrothermal valve do its thing.
try keeping it in the middle and see what happens.

the other poster was right, WOT stall will either be getting flooded out or is running low on fuel. assuming you have a crankcase vacuum pump it should be very easy to hook a gauge up to that to see if theres too little output pressure to the carbs or hooking the gauge up prior to the pumps to see if vacuum indicates a pre pump blockage.

 

[finlay]

Re: Yamaha 60 outboard stalls when taking off

if it idles fine the inrichner/chock on #2 carbie is not the problem at all....

if it dies when you punch the throttel to full you may possibly have a blockage in one of the main jets within the carbie.

to eliminate the fuel pump...start the motor and let it idle...while its idleing have someone pumping the primer pulb then puch the throttle, if all is good then the fuel pump is and issue...suspect hole in diaphram...