https://partscatalog.deere.com/jdrc/sidebyside/equipment/80153/referrer/navigation/pgId/2564950 Look at part 36 O Ring to see if it is damaged and allowing too much fuel into the main jet.
I should also note that the other end of this tube attaches to the cylinder head, and not the engine block. Not sure exactly what that entails and whether I’ll need to remove the entire head to address the issue.Well, I’m back from vacation, so I started back in on this JD tractor again. In following Hammermechanicman’s suggestion to check the breather, I removed the wide breather tube from the air intake, and I was able to start, run, and throttle up the engine without the black smoke and rough running, so it’s apparent I have a crankcase breather issue. Does anyone here on this forum have experience with these Kawasaki breathers that can offer tips on what to look for, that could be a probable cause of the running rich issue? Possible crud in the valve? Breather valve failure or damage? Thanks, in advance for input!
In my previous post, I mentioned that the engine started and ran flawlessly, at all speeds, but failed to mention that was with the air filter OFF. Even after reinstalling the tube insert and breather tube, it ran flawlessly, at all speeds. However, when I reinstalled the air filter, the black smoke and rough running resumed. I lifted the air filter for a few seconds, and the engine smoothed out and ran good again. I examined the air filter and pre-cleaner, and could see plenty of light through the paper element, and the pre-cleaner was clean. So I’m guessing this engine still can’t breathe with this air filter, even though it appears clean. I will replace it and see what happens.I should also note that the other end of this tube attaches to the cylinder head, and not the engine block. Not sure exactly what that entails and whether I’ll need to remove the entire head to address the issue.