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Old 11-04-2012, 19:22   #1
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Yamaha F8 stalls but restarts immediately

My Yamaha F8 stalls out when I give it gas, but it can be restarted immediately with 2 or 3 pulls.

I cleaned the carb.
Jets looked clean.
I cleaned the fuel pump it gave up a bit of discolored fluid as I sprayed it out with carb cleaner. The check valves seemed a little dirty too.
I replaced the engine end of my fuel line as the gasket had a tear.

After all that I still have the same problem. Any ideas?

Thanks!
-p
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Old 11-04-2012, 19:47   #2
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Re: Yamaha F8 stalls but restarts immediately

I would be looking at the jets and cleaning them properly
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Old 11-04-2012, 19:50   #3
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Re: Yamaha F8 stalls but restarts immediately

Check for a good seal between the carb and the intake manifold,,if you have a leak there it will act like your description.
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Old 11-04-2012, 20:34   #4
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Re: Yamaha F8 stalls but restarts immediately

Sounds like fouling from gas with ethanol that sat around. Get fresh gas. Replace the filter. Take the carburetor to a shop that will put the whole thing in an ultrasonic cleaner.

Carl
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Old 11-04-2012, 21:01   #5
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Quote:
Originally Posted by boris
I would be looking at the jets and cleaning them properly
What would they look like if they were dirty? They looked clean to me...
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Old 11-04-2012, 21:02   #6
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Quote:
Originally Posted by Nemo55
Check for a good seal between the carb and the intake manifold,,if you have a leak there it will act like your description.
Hmm... Would I have a gas leak if that was the case?
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Old 11-04-2012, 21:03   #7
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Quote:
Originally Posted by CarlF
Sounds like fouling from gas with ethanol that sat around. Get fresh gas. Replace the filter. Take the carburetor to a shop that will put the whole thing in an ultrasonic cleaner.

Carl
I do not suspect the fuel. It's not old and it's running fine in my generator. But I did think about that too.
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Old 11-04-2012, 21:52   #8
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Re: Yamaha F8 stalls but restarts immediately

Does it run well at full throtle if you ease into it (not quick acceleration)?

If so, a weak accelerator pump.
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Old 12-04-2012, 17:30   #9
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Well, thanks everyone for the assistance, but today the darn thing works fine. I'm going to chalk it up to a air bubble or something. We'll see how it goes I guess.


Thanks again!
-Patrick
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Old 12-04-2012, 17:43   #10
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Re: Yamaha F8 stalls but restarts immediately

My guess is still dirt caught in the slow speed jet in the carburetor. I'm guessing it is a 4-stroke, and that means those passages are tiny! If there is any restriction at all your fuel mixture will be off. Sometimes I have had to clean the carb more than once because some teensy piece of crud relodged in there. Absolutely need a fuel filter between the tank and the engine if you have a 4-stroke.
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Old 12-04-2012, 17:46   #11
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Re: Yamaha F8 stalls but restarts immediately

It sounds like the off idle ports are plugged.
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Old 14-04-2012, 23:14   #12
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Quote:
Originally Posted by perchance
It sounds like the off idle ports are plugged.
I think I need a detailed diagram of a carb ...

-p
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Old 14-04-2012, 23:17   #13
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Well, yesterday fine. I left the tank hooked up last night.

Today, can't pull the starter.

I unhooked the tank, drained the carb, pulled the starter a few times with the run switch off and throttle wide open to drain everything.

Put it all back together and it fired right up...

Confused...
-p
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Old 14-04-2012, 23:24   #14
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Re: Yamaha F8 stalls but restarts immediately

To clean the carb, you must disassemble it and soak it in carb cleaner at least four hours and preferably overnight. I know it looks good after spraying it out with carb cleaner but it needs to be soaked.
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Old 15-04-2012, 06:42   #15
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Re: Yamaha F8 stalls but restarts immediately

Quote:
Originally Posted by Patrick_DeepPlaya View Post
I think I need a detailed diagram of a carb ...
-p
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