New JD X390

sivicman

Active Member
I got to use my new X390 over the weekend for the first time. We have had a drought here in S. Alabama, so the grass is not growing. So far so good. The Kawasaki engine drinks the gas I've noticed. My only complaint is the seat does not go back far enough for me. I am 6' 2", and always hit my knees getting on and off the mower. Does someone make seat rail extenders so I can modify the seat?
 
I ended drilling 2 new holes and putting in new nutserts. I gained 2". That helped out a lot.
 

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My new mower with 8 hours on it is back at the dealer for service. From day one it has been surging at low and medium throttle. Over the weekend it backfired on me at medium throttle a couple of times. Has anyone else had this problem?
 
I ran into similar issues when I was a service manager due to gas that sat in the new rider tanks for months before they were sold.

We came up with a "nurse tank" to connect to the carburetor and run them log enough to place the on display, then run the carburetor dry. The fuel tank would never have fuel put in them until a rider was sold. It eliminated many of the new rider having issues like you describe.

I hope the dealer resolves the issues for you.
 
JD dealer called and said they could not duplicate. Image that? They are going to look into it further and get back with me.
 
My new mower with 8 hours on it is back at the dealer for service. From day one it has been surging at low and medium throttle. Over the weekend it backfired on me at medium throttle a couple of times. Has anyone else had this problem?
Update:
I got my mower back from the dealer. The service manager said there was debris in the carburetor. He said the jets were dirty. Whatever it was, it made it pass the fuel filter. The engine is running smooth now.
 
Hello S.,

That "debris" was fuel that has sit too long in the fuel tank and carburetor/injectors or in a storage container. Modern fuel does not hold up like it did years ago, especially ethanol blends. The fuel breaks down and creates a "shellac" from the additives in the fuel has it evaporates. This stuff begins to flake off and plug up the fine passages inside carburetors weeks after a machine is purchased and used a few times.

Of course, the factory warranty clearly states this is not a covered "defect", but most sensible shops take steps to prevent this problem, or they correct it later for free to maintain their reputation and customer relations.

Note: Don't expect the shop to only put non-ethanol fuel in their equipment during initial setup and test running.... Some areas do not have it available.

I am not a big fan of pour in fuel additives, but I have been using Ethanol Shield for a few years and have had good results in my own equipment. Products like Sta-Bil do not hold up well in my area of South Texas.

Ideally, the best thing to do is run your equipment and use up the fuel all through the year and not let it sit for months at a time.
 
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