7.5 Briggs OHV. The RPM surges up and down slightly when the choke is off. Has new sparkplug.
It will hold a steady RPM if choke is on halfway or I hold a finger over carb throat.
I have cleaned the carb as well as I can tell. There are no blockages.
I tried adjusting the governor. I tried moving the throttle tang that the spring attaches to and still surges.
To adjust governor(looking straight down on engine), I held governor lever counterclockwise(makes carb butterfly open to full throttle) and spun the governor shaft counterclockwise. The adjustment was good before I started.
A new carb is about $50 so I was thinking about opening up the small jet on the carb bowl plug and see what that does.
Is there anything inside the head that would cause it not to get enough fuel into the cylinder? The compression seems good so I am assuming the valve adjustment is ok.
engine schematic
It will hold a steady RPM if choke is on halfway or I hold a finger over carb throat.
I have cleaned the carb as well as I can tell. There are no blockages.
I tried adjusting the governor. I tried moving the throttle tang that the spring attaches to and still surges.
To adjust governor(looking straight down on engine), I held governor lever counterclockwise(makes carb butterfly open to full throttle) and spun the governor shaft counterclockwise. The adjustment was good before I started.
A new carb is about $50 so I was thinking about opening up the small jet on the carb bowl plug and see what that does.
Is there anything inside the head that would cause it not to get enough fuel into the cylinder? The compression seems good so I am assuming the valve adjustment is ok.
engine schematic