What Is The Problem Here ??????
Jeanes. . .YOU may know that. . .but do the prospective BUYERS?????
If you WANT to sell the motor. . you have to SELL it. . not just put it out there with a few words of what it is and a price and hope for a reaction. THEN you have to sell YOURSELF if it is not a name-brand motor, because YOU are the one that people are going to refer to in case of problems.
Fail at EITHER part of a sale, and YOU will NEVER get the sale. . It's up to YOU, not the rest of the modelling world, to convince THEM that your product is worthy of THEIR hard-earned money.
Once you achieve that, you will get a sale. Until that time, no one wants to hear the whining and complaining. . We are ALL Grown-ups here (I HOPE!!!). Accept the limitations of what "customers" want, or forget trying to sell anything to anyone.
Now. . give it a rest.