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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 25636
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Kubota zg23 running rough and missing when I engage the

Customer Question

Kubota zg23 running rough and missing when I engage the blades. replaced plugs and fuel filter. still doing it
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: 3 days
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: I don't think so
Submitted: 2 months ago.
Category: Small Engine
Expert:  JON replied 2 months ago.

Hi, my name is ***** ***** welcome to I will be happy to assist you today. Give me a few moments to look over your problem, and I will get right back to you so we can fix the issue and get your machine back to working order

Expert:  JON replied 2 months ago.

Does it only do this when blades are engaged?

Customer: replied 2 months ago.
Expert:  JON replied 2 months ago.

What engine is on this machine?

Customer: replied 2 months ago.
23 hp gas engine
Expert:  JON replied 2 months ago.

Kohler, Kawasaki, B&S.

Sounds like the valves need adjusting if it only runs rough under a load.

Customer: replied 2 months ago.
how do I do that?
Expert:  JON replied 2 months ago.

This engine should be a twin cylinder engine so you are going to have 2 sets of valves. Will need engine info to determine Valve clearance GAP. You will need feeler gauges, sockets, ratchet, wrench, and possibly a torx or allen set. If you have all this I will type out instructions or find a video of valves being set properly and send to you

Customer: replied 2 months ago.
I have all the tools. its a 23hp v twin gas Kubota engine
Expert:  JON replied 2 months ago.

Okay. Do you have the owners manual to this machine, or do you need the valve clearance?

Customer: replied 2 months ago.
I just looked at the rocker arms and there is no adjusters on my rockers
Expert:  JON replied 2 months ago.

Are there any numbers on your engine to identify. I need to OPT OUT as I am not certified to repair Kubota engines, but can look the info up for you through my dealer

Customer: replied 2 months ago.
I don't know where the numbers are but it has a sticker on the top that says 23hp v twin and it is a Kubota zg23 gas engine
Expert:  Curtis B. replied 2 months ago.

Let me see if can help. With twin engine, I always start with a cylinder balance test. Loosen the spark plug wires, and with engine idling, remove one wire at a time. Engine should continue to run. If engine dies when either wire is removed, the opposite cylinder is not firing. This engine is built by Kohler for Kubota. it has hydraulic lifters, so there is no valve adjustment. If you do have a cylinder that is dead, check it for spark. With kohler, the ignition coil/module is likey bad.

Expert:  Curtis B. replied 1 month ago.

I se question is still open, did you find problem?

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