[RCW]

If you are bogging only at the top end it is your main jet.

I really do not know if it is rich or lean, because I have no idea of how much air the snorkel kit will flow, but if it restricts your air flow you will be rich. As a rule of thumb for every inch you add in distance on an air intake you should add a quarter inch of diameter to the pipe to avoid restriction from air friction in the extended intake plenum. So, if you added a 1.5 inch snorkel and used the same size pipe as the air inlet, you are likely running rich and will need to reduce the main jet accordingly.

I am not sure of what sort of packing came out of the muffler, that generally is usually only sound deadening along the sides of the can and will not reduce back pressure. But if some of the baffles have been removed or are rusted out, then you may have reduced back pressure and created a lean condition with the carburetor main jet and need a larger jet size.

A lean bog generally will generally create a bit of a surge as the engine hits full power while running with a load and tries to rev then drops back and then tries to rev again, etc. A rich bog will generally simply run you out of power then tends to darken the spark plug insulator. A lean bog will hurt engine with overheating and piston damage, and a rich bog will generally only just eat spark plugs, dirty the oil quickly, and cause excessive fuel consumption.