First off- thank you ALL for your input and help. Y'all have saved me quite a bit of money and untold headaches!
I contacted Kioti's Product Support Dept. and explained the problem and the steps taken to narrow it down to the injector pump. Kioti agreed to supply a new pump without cost; the only stipulation was they would send it to my dealer and it was up to me and the dealer to work out getting it put in. Even though the 4yr. warranty ran out in May, the injection pump was only covered for 2 yrs, which means they REALLY went above and beyond. I could not ask for more from a company that realizes they sold a faulty part, but are willing to make it right. I will stay loyal to any company that will stand behind their product the way Kioti has.
Again, thanks to this forum for the power it has given consumers like me to be armed with knowledge we would otherwise not have.