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wont idle by itself, surges at high rpm. turn on mower runs fine. Need help or some input as to what might be wrong
John Deere zero turn
model 44L 777
type 0138 G1
code 100111YG
z425

Remove the carb, and give it a good cleaning paying attention to all the small holes, You have something is the idle circuit of the carb. Most people don't know that an engine runs on the idle circuit even at full rpm with no load. It will open the butterfly under load and then use fuel from the high speed circuit. Which will explain will an engine that surges will operate fine under load.

I can send you a Service Manual for your engine IF you like, address below, put in proper format and remind me engine model and what you want.

Walt Conner
wconner5 at frontier dot com

I have a 23HP Briggs & Stratton on a JD Z turn mower , Where can I get a GOOD used alternator , ? model#44L7770144G1
kcred55@yahoo.com

There should be a good supply of them at most small repair shops for lawn mowers.

Walt Conner