I recently purchased a new SuperTigre Engine (GS45ABC) to install on a Sig Kavalier. The engine starts easily and runs great. Unfortunately I am having serious difficulty in having the engine stop reliably.

I have set the throttle to complete close when the kill switch is activate.
The throttle stop screw has been backed out significantly to allow additional movement of the throttle barrel. Presently running with the idle stop screw removed.

The engine runs well at high speed, transitions from idle to high speed without any issues but does not stop when the throttle is completely closed!!!!

What am I missing????? Any suggestions for me to try!

Thank you, in advance for all your help.

NJJD