I have this briggs engine on a Husqvarna Tractor
Model 407777
Type: 3195-G5
Code: 130413YG
It starts and runs but experiences a random popping. Sounds like through the carb. RPMs will wander slightly at lower RPMs. Max RPM is about 3100. The machine is maintained and in good condition. My guess was either flywheel key or valve issue. I started with valves because the owner mows a meticulous yard and hasn't hit anything. The blades are a few years old and pristine.
I pulled the covers and found the intake on one side to be about .009 and the exhaust on the other is also .009. Valves appear to fully actuate.
The engine manual says .004-.006 for both. Would this excess clearance cause this? I'm waiting on gaskets for the covers and was wondering if I should be chasing anything else in the meantime. I wanted to try spec settings on the valves before pulling the flywheel.
I remember reading or watching something a while back about having to adjust the throttle cable on a twin because it was leaving the choke partially closed but I can't remember if it was this Briggs. Maybe I'll check that as well.
Thank you