Ok I have learned nore about the MDS40 in this post than I have raading the manual. I too would like to give the engine a chance. I sent the first back to Horizon when my instructor could not keep it running on my XtraEasy trainer. I few a KB 40 on the trainer that a friend gave me and I never had any problem. I learned to fly on the Xtra and the KB engine combo. I recently took the replacemnt MDS 40 out of the box and am trying to get to run.

I now have learned about the fuel (5%) and the long reach idle bar. Please tell me how to run it in on the test stand. Please be specific as to time on and off, how long rich and how long lean, what RPM, what prop, how many clicks should I move the needle each time, and how do I set up the low side? Also I guess that I have a stupid ear because I cannot tell the "2 cycle and 4 cycle break" because the engine either quits from too rich or too lean.

Thanks all