Ok, Z425 with Briggs 23HP OHV engine. Model 445577-0122
Checked flywheel keyway. ok
Replaced carb with new. ok
Checked coil gap. ok
Spark plugs. ok
Adjusted valves, 1/4 inch past TDC ok (twice)
Run like a top before shutting it down last time. Pops and backfires through carb trying to start now.
Checked compression in both cylinders today. 180 on one and 120 on the other. 180 seems awful high to me.
I did all the things above and it still backfires through the carb when trying to start.
Before I rip into the low compression cylinder, is maybe the valves still out on the low compression cylinder?
Forgive me but it has been 50 years since I worked on these small engines at this level. HELP?
Thanks
Checked flywheel keyway. ok
Replaced carb with new. ok
Checked coil gap. ok
Spark plugs. ok
Adjusted valves, 1/4 inch past TDC ok (twice)
Run like a top before shutting it down last time. Pops and backfires through carb trying to start now.
Checked compression in both cylinders today. 180 on one and 120 on the other. 180 seems awful high to me.
I did all the things above and it still backfires through the carb when trying to start.
Before I rip into the low compression cylinder, is maybe the valves still out on the low compression cylinder?
Forgive me but it has been 50 years since I worked on these small engines at this level. HELP?
Thanks