indy61 wrote:I'm not sure what the idle tube does but my Cub ran fine without one. I decided to rebuild mine when I noticed the top was warped and it had a broken/missing idle tube. Ran fine at idle or full throttle?
The calibrated orifice (.021") is in the threaded end. As long as the gasket seals around it, and the remaining piece of tube is not crushed, it may function correctly. I believe George Willer made that observation years ago.