Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Both sides have spark? This engine should run , even it only one cylinder is firing. Have you ran a compression test? I have a 2510 in my shop now, so I know it well.
Thanks, ***** ***** , spark, and compression, check the exhaust, next would be to check the flywheel key.
Could cylinders be flooded? Pence off the fuel supply line, remove spark plugs and spin engine to clear cylinders, the re-install spark plugs and see if it will fire with fuel cut off. Do you have suction on the carburetor throat if you hold hand over carb opening? Have you ever had the rocker covers off and checked the valves?
Push rods not bent and valves set around .006 inch, intake and exhaust.
Push on the valves to be sure valves are not stuck If valves are moving, just replace the pushrods! They are the smallest I ever saw!