Are cherry hot mufflers normal?
Newbie here, but not new to blowing snow. I recently obtained 20 some year old Noma powered by an Tecumseh HMSK80. I have run it a few times and have noticed that within minutes the muffler becomes cherry red, and occassionally backfires. Flame can be seen coming out of the muffler. I have never seen the red hot muffler like that. Some claim that it is normal. Is it normal to be red hot like that?
I did some research on the internet and was pointed in two directions, a dirty carb and stuck valve. I cleaned the carb, but did not rebuild it, except the bowl gasket because I could see gas leaking out from around it. This did not seem to solve the red hot muffler problem. I should mention that the machine was not performing properly when I experienced this it would surge and hunt. The machine does seem to run somewhat better after the cleaning. I should also mention that I can hear a squishing noise in the carb when the primer is pushed and fuel comes out of the choke plate area when the primer is pushed. Is this normal?
Next I sprayed seafoam in the spark plug hole onto the valves. I can observe the valves moving up and down. I still am getting the red hot muffler.
I am to the point where I am ready to buy a new carb if this will resolve the issue. Will it?