toddlamp8 wrote on 12/31/69 at 16:00:10:I'm having a similar problem. I just changed the exhaust to the HD muffler and I'm getting 40mpgs, soot on the rear brake, and flames. I never touch the carb. I've got an 86' and have a 155 jet stock.
I did just notice that my idle screw had to o-ring on it, but I don't quite understand what's going on. With the stock exhaust everything seem to be running great. Is the HD muff MORE restrictive???
Don't know exactly what an "HD mufler" means, but I do know that if it wasn't designed for the Savage that you can get unpredictable results.
Is "had to o-ring on it" a typo? Does it have 2 o-rings on it?
One thing for sure, soot means you are too rich.