Hi. I have a 17.5 hp in my John Deere D100. It was running great but just started doing this. I can't figure out what's wrong. I tried to attach a video but the forum wont let me add an mp4. The motor starts, runs good for a few seconds, then starts sputtering and blowing black smoke. When it does this the governor moves back and forth. It will do that for a few seconds then go back to normal and the governor stabilizes. Any help would be appreciated.
Tiger Small Engine
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- Dec 7, 2022
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Sounds like choke is hanging up momentarily, then recovering and running right.
Post it up on youtube. Link it here for us to view.
Means a rich condition. Carb needle sticking open or choke not locked open once warm/hot. Pressure test the carb needle/seat at 7psi for 30 minutes. Many a youtube video on how to pressure test carb needles.
Pull the oil dipstick and smell for fuel. If you smell gas, report back here. AND do NOT run the engine if you have diluted oil inside the crankcase. Fix the fuel issue and dump the oil a couple times.
I would clean/renew the entire fuel system. Clean and flush the tank like a new one. New fuel line from the tank to the carb. New filter and shut off valve are good items to install. Make sure you have a solid flow of gas AT the carb inlet. Drain into a glass jar.
Guessing water in the gas. Drain the tank into a jar and look for water in the bottom. This fits your condition to a T.