My ZT1 is about 2023 model, a 50” with the 23 hp Kawasaki FR691V engine, and mine has a MANUAL choke. Are you SURE you have an automatic or throttle-controlled choke (entirely possible you do since yours is a little older and a possible different engine variant)? The attached photo shows my panel, and the choke lever is the round knob at the very right side of the photo, just to the right of the throttle lever (it’s NOT clearly labeled).
Mine starts instantly, every time, using the following procedure:
1) Throttle CLOSED;
2) Manual choke ON (pulled up) about half way or more;
3) Twist the key with my left hand while my right hand is on the choke knob
4) The instant the engine fires, I press the choke knob back down fully (so the choke is off).
I live in Kansas, so my summers may be shorter, but are just as hot.
I do this 100% of the time - engine hot or cold, I have tried hot starts without the choke, and it will occasionally start that way, but it works so much better using the above method, it’s not worth it for me to try starting without the choke.
In any case, over the years I have found that different engines have their own personalities, and very often will respond to starting techniques different from what is laid out in the owners manual. Basically, if you find a different way that works, use it.
If you DO have a throttle-controlled choke (if moving the throttle is supposed to close the choke as you described), the throttle cable or linkage may simply be out of adjustment. You can verify the choke is closing by taking the top off the air cleaner and observe whether the choke butterfly is actually closing completely when you shove the throttle all the way forward. If it’s not, it may be a simple adjustment to solve your problem.
They’re great mowers, so I hope this is of some help!
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