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Along the same lines my old 650 Mac has nearly open exhaust .Because of that fact the idle screw has to be set extremely rich ,it puffs black smoke at idle . However that Tilley H L carb is considerally larger than the one on that Stihl and it's possible to get enough fuel to it so it will...

I didn't miss it .Just reenforcing what B already had said .;)

Depending on how big of a hole you carved in the muffler it most likely doesn't idle worth a hoot either . It's just typical of what changes when you relieve the back pressure and is easily cured with a turn of the jets . Follow that Madsen thing and you'll be in like Flynn .