Thanks very much for the reply. I am going to go at it thoroughly today. I was just checking to make sure the "fix" from my test was taken into account because it just baffles me how it could have solved the issue for another 45 minutes of runtime last mow.
This sounds like good advice. Does any of it makes sense given that it runs fine for an hour or more, and the problem gets fixed by starving the air flow for a second and then it runs fine again.....?
The mower is a 2006 Simplicity Javelin RZT2044 with about 125 hours on it. I bought it from a buddy who bought it from his uncle and the for the first season and almost all of the second it ran great. It has a Briggs and Stratton 20 HP V-Twin model number 441577 - 0118B1 engine in it.
I have...