On Thu, 18 Apr 2019 16:15:30 -0400, Leon Fisk
wrote:

On Thu, 18 Apr 2019 10:01:04 -0700 (PDT)
wrote:

My Scag FH580V wants to bog down in taller grass
and want run at full throttle. I have changed both ignition coils.
And when I pull the right plug wire off it shuts off what else could make it do this?


Kawasaki? Just a WAG.. Neighbor with similar motor on a Toro EZ had a
sticking choke. The shaft with the choke butterfly on it is plastic or
similar material. It swelled up and was sticking in the aluminum carb
housing. Easy to check, make sure the choke is opening up all the
way...



Yep - Kawasaki engine used in many machines ..

https://www.engine-specs.net/kawasaki/fh580v.html

The time-of-year made me think of mouse nest - but -
choke issues might be also a possibility.
Choke stuck on usually results in rough running / rough idle
after a few minutes - from very rich fuel ...
regardless or engine load .. ?
engine load can improve performance slightly
with high fuel mix. ?
John T.