I am going through my Honda Mower OM(HRX217HXA). At 100 hours, it says, grease the pinion gears. How do you do that? At 150 hours, it says to Adjust the valve clearance and the idle speed. Also clean the fuel tank. What? Clean the fuel tank. At 250 hours, clean the combustion chamber. We don't even do that on our cars. Does anybody do these? I like to get my stuff to run as long as I can. On my Kawasaki at 300 hours, it says to clean combustion chamber, check and adjust valve clearance, and clean and lap valve seating surface. Now I am not close to 300 hours on the Kawasaki, and I don't think the Honda is due for its 250 hour service, but how do you do all that if necessary. Or is it? We don't even do these in our cars.