i have seen many post about when a sammy warms up it will try to stall when you stop.i have the same problem with my sammy . i am waiting to put the newly rebuilt engine in my sammy. i have seen many ?s about this but no answers. when i pull the motor i found no vacums leaks hose are all new carb is very clean and the timing was dead on. new spark plugs ,wires, ,fuel filter and cap and rotor.plus i had 91 octane gas in it. so what the hell could this be??? i had some bearings stacked on my crankshaft which is the cause of my rebuild. but if someone can answer this they are the man.. billjohn or baratcus, you 2 seem to be the ones with the answers so i hope you or anyone else can answer this.