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It sounds like you've already done some troubleshooting with the fuel system, which is a good start. Since the engine runs smoothly after sitting for a few hours, it could be related to heat affecting certain components. Here are a few potential causes to consider:

Ignition System: Check the spark plugs, ignition coils, and ignition timing. If there's an issue with ignition, it could cause misfiring under certain conditions like heat buildup.

Cooling System: Ensure that the cooling system is functioning properly. Overheating can lead to engine misfires and rough running.

Compression: Perform a compression test on all cylinders to check for any compression issues. Low compression can cause misfiring and rough running.

Fuel Injectors: Even though you've cleaned the fuel filters, it's worth checking the fuel injectors for clogs or malfunctions that could affect fuel delivery to one of the cylinders.

Engine Sensors: Faulty sensors such as the crankshaft position sensor or engine temperature sensor could cause issues with fuel delivery or ignition timing, leading to misfires.

Exhaust System: Check for any exhaust leaks or restrictions that could affect engine performance, especially when the engine is hot.

Considering the symptoms you've described, it's likely a problem related to heat affecting a specific component or system. If you're not comfortable diagnosing these issues yourself, consulting with a mechanic or a Honda specialist would be a good next step. They can perform more detailed diagnostics and pinpoint the exact cause of the misfire.

Honda H6522 diesel misfiring
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Replies 2 Post by gagaid99

I agree that the Polaris is high on Kool and low on reliable. I like the Honda, Deere and Kubota in that order.

What is the best UTV to buy Polaris or
Utility Vehicles UTV/ATV
Replies 8 Post by gagaid99

I would greatly appreciate some opinions on this! I have a JD gator 620i that I have been working on for the last week and a half. I am not very knowledgeable when it comes to working on vehicles. I know just about the basics of troubleshooting. I had just changed the battery and had it up and running fine. I drove over to the barn and was going to put gas in it and i left the engine running as I did so. it shut off as I was filling up. I am wondering if I could have possibly put bad gas in it so I syphoned the gas out and put in new. It still would not work. I thought maybe I flooded it so I took the spark plug out and it smelled of gasoline. I cleaned the spark plug. It didn't work. Do I need to get a new one? Is it possible that their is gas in the oil? Keep in mind that it was working perfectly before I put gas in it.

Starting John Deere 620i
Utility Vehicles UTV/ATV
Replies 3 Post by gagaid99