When i shut my "T" off there is a loud pop from the exhaust. I have read this is caused by unburned fuel. So do I have it running to rich, or is there some other cause?
Is the engine idling s-l-o-w-l-y it can be caused by shutting down with the engine idling too fast or rich mixture if your engine is idling slow then most likely you are running rich.
The throttle lever is all the way up to run the slowest possible RPM, but to me it sounds kind of fast. Could it be because the linkage between the throttle lever and carb. is loose or bent? I need to look into that, hopefully tomorrow AM.
Have to close throttle AND retard spark on mine - let her run that way for a minute or so and then shut her down (or she'll pop every time). I run her pretty lean too.
My riding lawnmower does that unless I let it idle down for 15-30 seconds. Then no pop.
It was recently tuned by a professional but has been this way since new (4 years old now).
My T's never have.
Somewhere in the dark recesses of my very tired, very old mind, I have a recollection of something similar happening with an engine that should have the carbon cleaned out of it. That's all I remember and can't tell you if it's related to your problem. A rich fuel mixture? Maybe?
Thanks Ron I'll try that. Actually I had the same problem with my riding lawnmower, John Deere, I always let that idle for about 30 seconds before shutting it down, if I don't it pops.
Carbon... As Mike Said,
I second that.
If you have the engine running quite fast and then turn off the ignition some fuel mixture will be drawn through the engine and out the exhaust. when it reaches the hot manifold, it will explode. Try slowing the engine to a slow idle first before you turn off the key.
"The throttle lever is all the way up to run the slowest possible RPM, but to me it sounds kind of fast."
Have you tried adjusting the idle speed adjusting screw on the carburetor?
yes i have the idle adjustment screw backed way off