cafoose 3,742 #1 Posted 10 hours ago I was mowing with my 520-HC and I noticed the oil light came on. I promptly added oil to the full mark and it seemed to have lost power and started missing. I checked compression and the front cylinder is 85 and the rear is 0. It still starts and no loud knocking like a broken rod. I did notice wet oil drips underneath but nothing like a vented block. I hear they're expensive and difficult to rebuild. Thinking of a possible repower. 22 HP predator is $950 and 16.8 is $450. Is there really much difference in performance between the two for just running a 48 inch deck? Any other options or suggestions? Share this post Link to post Share on other sites
Sparky-(Admin) 25,715 #2 Posted 1 hour ago Might just be the valve seat let go. Is it the rear cylinder that’s at 0 psi? 1 Share this post Link to post Share on other sites
ri702bill 12,320 #3 Posted 1 hour ago 19 minutes ago, Sparky said: Might just be the valve seat let go. Is it the rear cylinder that’s at 0 psi? YUP - does it have over 1100 hours on it? That seems to start the countdown clock on them to the issue at hand. Share this post Link to post Share on other sites
