Thanks for the information, I only have around 14 hours on it. I had to have the original engine replaced after only 10 hours on it. It came with a 25HP, and the John Deere dealer put a 24HP on it. I don't know what happened to the first engine other than it sat for over a year during COVID and only ran for five minutes when I started it, and never ran again. I did get rid of the quick oil change filter with this new engine.Try a leaf blower or compressed shop air first. Pull the engine shroud and clean the cooling fins, all around the block.
I applaud the cleaning effort. Turtle Wax the deck and apply used motor oil to the under side of the deck. Tires properly aired up. Valves ran.