I don't know how your Honda engine matches up with the ones JD put on the f510 & 525 series mowers. I have a 510 and have had no luck at all getting the oil leaks stopped. I have had it to the JD dealer twice for the problem. They say it's fixed but the fix doesn't last very long. They have slowed it down a bit but still leaks when sits between mowing. I can't see anything leaking when it is running. Oh well, I spent enough money on it so will use it as long as it will go (17 years and counting) and then replace it when the time comes. Hope you have better luck with yours.