[Shrewcub]

I run mine wide open to cool down with no load, then idle for 10-15 seconds and as I am turning the key off go to WOT. That is how the PO advised me to do it and I have no backfiring if I do it this way. My 1864 halfway on the throttle is still idle so even the supplemented way goes boom.

Sorry the compressed pic is hard to read but the original manual says shutdown from SLOW setting and the supplement says halfway between SLOW and FAST.