Re: mower stalls after an hour
I'm not sure the battery is the issue. Long as it spins the starter, over at a decent rate, the engine produces its own spark via magnetos.
#1: Be sure that all wire connections are clean and tight. Do this anyway just to eliminate it as a possible cause.
If the issue is the starter won't spin the engine, try swapping in a known good battery for a few test starts/runs. If it operates OK, then battery, or relay, or switch is the issue. I had a battery once that would short internally when load placed on it. Odd, but it acted similar. Voltage was OK, but loaded, wouldn't turn starter. If the same thing happens with a known good battery, then look to the starter, starter switch, or relay. Try to jump known good battery direct to starter. If that works OK, then likely its a switch or relay. If that doesn't work the starter has an issue.
Hope some of these ideas might be helpful.
EDIT: This applies only if your engine is run by magneto generated spark. You didn't mention what engine this was.
X 500 48" Deck 48" blade
Stihl BR 600
Sears Suburban Super 12 1968
Craftsman 1990 something LG Tractor 46" deck
Original Kohler 8hp Giant Vac early 1960s
Last edited by Alien5044; 06-12-2019 at 02:53 PM.
Reason: Added thought