I need some help with a 30 year old Snapper push mower with a 4HP Briggs motor. It was working fine then it stopped when the owner pushed it up a slight incline under a shrub. It stalled and would not restart for her. Owner added new plug, checked the oil, and the usual - all checks out. I have messed with a bit and this is what I have discovered about it:
- Spark is good
- Will not run on carb cleaner thru the carb or plug hole
- Repeatedly backfires thru the carb
- If you pour gas into the carb and try to start it the gas will spray out of the carb
Based on all of this I am thinking that the intake valve is sticking open. Any other thoughts or suggestions before I pull the shroud and head??