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Discussion Starter · #1 ·
My 4hp yamaha f4a outboard will fire up with the choke out fine, once it is running it is not very responsive with the throttle and will rev up uncontrollably and then when the choke is pushed in it will rev up uncontrollably even more so and then stall.

Does anyone know the potential problems? It has not been properly run for many years (only me messing around with it) it has had fresh fuel. Is a dirty carburettor the only potential problem?

Any help would be very very much appreciated.
 

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Discussion Starter · #3 ·
Thanks for your reply, however, I'm unfamiliar with some of the terminology that you have used (apologies).

I can see two things that can alter the carburettor. The throttle cable and the choke arm. Are you saying to just check whether these are both springing back as they should and that they are not gummed up?
 

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Discussion Starter · #5 ·
Thanks Paul, it seems like mine has a different problem than the 2 stroke. I don't know if I forgot to mention that Mine is a 4-stroke also mine will not ever run smoothly and will rev-up and stall when the choke is pushed in/ rev up un controllably when the choke is out.

Seems like fully cleaning the carb is the best option, any other ideas of what it might be?

Thanks,
James
 
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