My reason for checking compression!
The Guy before the guy,suppose to replace a valve. On that note,he is 80 and gets alot of mowers in,fix them and sells. He also said to put alittle oil with a full tank of gas, the-gas is what is what causeing the problems. I know this guy for 15 yrs. He sold it another guy I know,and said that zero turns,are not very good up hills, that he will just keep on useing his 455 john deere. I changed the oil and filter,and getting ready to change hydro fluid,so I thought that I should check compression, to see how bad shape that it is in. So after all of your all help,and thank you very much,I should check valve settings, and do both sides.I would like to make it run as good as I can.THX