85 2 stroke choking on full throttle

[Clionagh]

My 85 2 stroke yahama outboard starts and runs great but when I go over half throttle it starts choking. Any suggestions what the problem may be?
Thank you

[robert graham]

Could well be plugged carb jets....have carbs ever been cleaned?....

[Clionagh]

No they haven't been cleaned.
I was considering changing for a bigger jet, what is your opinion on that? Do you know if it would increase the power? It's on an 18ft sea ray, would be nice to have a little bit more
Thanks

[robert graham]

If carbs are cleaned and set right you may notice better power....no need or advantage to change the jets. Consider installing a fuel/water seperater type filter on the transom to help remove water and trash before they reach carbs/jets. Walmart/Attwood sells a unit for $28....not much trouble to install and helps keep carbs clean.

[99yam40]

No they haven't been cleaned.
I was considering changing for a bigger jet, what is your opinion on that? Do you know if it would increase the power? It's on an 18ft sea ray, would be nice to have a little bit more
Thanks

If more fuel is added then more air has to get there too. Just putting more fuel in causes too rich of a fuel/air mix. The motor was engineered to run the was it was set up from the factory, just clean and run it.

Make sure the timing is advancing to specs